She can feel it straight away, as she starts to come round.
It's the new emptiness in her head.
She's alone.
The thought makes her bolt upright, glancing around desperately for any sign of a wilting Wanda left out on a table to die. Because she won't let her new sister do something like that. They'll have to tie her to this table to stop her from putting Wanda somewhere safe, no matter what she has to say about it.
Doc grabs her arm and looks her in the eyes, and she relaxes because he is fine.
And that means Wanda is fine.