Disclaimer: not mine
She's less close to her teammates now. Teal'c has never said anything to her, but she's sure he disapproves that Jack gave up his fight against the Goa'uld just for her. He's never complained but she knows he doesn't respect Major Levine, their new CO, as much as he did Jack, and it hurts her to think about it.
Daniel on the other hand once told Jack how happy he was that Jack had finally found someone, just like he had found Share five years ago. He wants them to have the fairytale ending that he couldn't hold on to, and Sam can't bear to tell him that it just hasn't work out that way. It's so hard keeping up the smiles all day, especially when she suspects that Daniel sees through them and merely humours her, but she's terrified of letting the illusion slip.
They never spend any time together in a group any more. She's tried taking Jack out on SG-1's team evenings a couple of times but one thing has become perfectly clear: Major Levine is definitely uncomfortable being around his predecessor. Jack on the other hand put on an impressive display of bonhomie at the time but froze her out as soon as they left for the night, managing to keep up his walls for several days afterwards. It's not hard to see that he hates the reminder of how things used to be, and she can't see how she can make that up to him.
But it's okay, because Samantha Carter doesn't make mistakes - clinging to that idea, she spends more time in her lab, where she knows it's true. She's intelligent enough to know that spending more time working won't make things any better but she can't talk to anyone about things. Everyone seems to have their own set of expectations of her and a list of occasions where she hasn't met them, and she feels weight pressing her down every day.
Jack's started inviting Daniel and Teal'c to their home on the weekends when he knows she'll be working, and she hates the nights when she comes home tired only to find a house smelling of pizza and a pile of beer bottles in the trash. She makes an effort not to complain though - she doesn't accuse him of having more fun without her, though she wants to, and he's stopped grumbling that she spends too much time in the lab. She wishes he still did.
Lately she's noticed Teal'c watching her more than he used to and she's sure he wishes that she'd resigned instead of Jack. She half-agrees with him. And Daniel keeps popping by her lab, bringing her coffee and donuts, offering to listen any time she wants to talk, but really there's nothing to say.