Let's start this one more time, from Johanna'a point of view.
The victor stalked back to her room after breakfast, ignoring her schedule. If the doctors couldn't get to the dining hall to save Boggs, then she didn't see what good her "follow-up appointment" would do. Not that they did anything at them anyway, since Johanna didn't trust the doctors and refused to tell them anything.
She ended up blowing off the entire rest of the day, too, until Alma called her from Command and told her that if she failed to show up, then she wouldn't be allowed over that night.
Johanna was physically present at the meeting, but barely paid attention and only contributed to say that someone was probably trying to undermine the Command staff and their undertakings. She said it more out of frustration at having to be there than actually believing it, but if there was a chance that someone would hurt Alma, then she wanted her as safe as possible.
No one took her seriously, though, and she didn't even take herself seriously when Leeg 1 turned up dead.
Suddenly, when Beetee was found strangled in his room, everyone jumped on Johanna's "break down Command" theory that she didn't believe anymore. She had never really believed it in the first place. After all, the first target of a Command shut-down should have been Heavensbee or Alma or someone else who made decisions, not a soldier when they hadn't even gotten to the main fighting part of the rebellion yet.
The woman considered joking at Haymitch to clean his side of the room more often, but the single shoe print left in the dust was oddly intriguing, like it had been left on purpose, as there were no other marks to show the walker's path.
After a few days of radio silence from the killer, Johanna was beginning to think that whoever it had been had finished whatever it was that they had hoped to accomplish. She was the one to stumble across Effie's body while on the way to Command, early for the meeting for once in her life. It turned out that she'd been the first one to go to the meeting room via that particular hall, and there were fortunately already people in Command, namely Plutarch and Cressida, to start doing actual investigative work.
It was faint enough that she was certain no one else would see it, but Johanna could have sworn she saw the front half of a shoe print in what must have been the only trace of dirt in the entire bunker and she walked past Effie again on her way back to her compartment.
Later in the afternoon, Plutarch brought her into an "interrogation room," clearly just a previously unused crawlspace with a table and what appeared to be hastily cleaned up blood stains, and started spitting out questions faster than she had ever heard him speak before. "What was it that lead you to take that path to Command today?" "Have you realised that you suggest the killer is targeting Command, but don't believe it, then maybe you do and maybe you don't? Doesn't that seem like it could be the killer's pattern?" "Weren't you at a nearby table the morning that Boggs died?" " Don't you also take to wandering the halls at night? Didn't you see anything suspicious around Beetee's compartment the night he was strangled?"
The questions kept coming before Johanna slammed her hand onto the small table between her and Plutarch and growled "Alright, I know I go unaccounted for a lot of times, but either accuse me or I'm getting out." After giving the man a couple of moments to respond, she stalked out, his eyes gazing sadly back at her.
She turned the corner when her interrogator's eyes dropped to her feet, which had tracked a small piece of paper from the closet into the hallway.
Johanna spent the next day's Command meeting glaring at Plutarch and left the moment the President dismissed them. She found him dead in the hallway the day after that. At that point, she'd seen enough dead bodies for a place that was trying to end things like the Games. She stiffly reported the man's death to the few people still meaning to attend the Command meeting before retreating to Alma's compartment and wrapping herself in the bed's blankets as tightly as she possibly could, hoping no one would come after her if they found out that she'd been upset with Plutarch just days before he'd been murdered.
That random soldier may have been cleared as a suspect, but that didn't mean she wasn't taking his place. Johanna could only hope that Plutarch hadn't shared his concerns with anyone else in Command.
Alma herself could hardly manage to coax the victor out of the warmth of the blanket or her own arms until it was time for the district meeting, where Alma would present Katniss' conditions for being the Mockingjay. Johanna had seemed mildly interested in what the teen would want, and she hadn't gone to the meeting where Katniss had laid them out, so she agreed to go.
Johanna felt as if her body was flying in front of the only person she still cared about before the sound of the gunshot even reached her ears. A sharp pain exploded through her shoulder, and the last parts of her brain felt Alma's hands on her torso, pulling her away, before she woke up in the clinic, unable to move her arm.
The President was sitting at her side as her eyes opened, and Johanna managed to choke out "Who…"
Alma Coin opened her mouth to reply, but you'd rather not hear it secondhand. One more time, from the top.