Right now, Hermione's concerns lie with closing the rift and in sticking together. If any of them get separated, there's no telling what might have happened to them - especially if she's the one to get separated, given how scared she still is of her own magic backfiring.

So when Jamie gets rid of the demon on Ruby, Hermione comes in and offers her a hand to help her up, casting a shield charm over both of them until Ruby can get to her feet and they can get to work on the rift.

Her hand aches, and even as she looks down at it, she can see it moving towards the rift. The shard stuck in her palm frightens her more than she's entirely comfortable letting on, but she says nothing, seeing that Jamie's already taken her advice to heart and hastily joining him. It might hurt, but it doesn't hurt nearly as much as being torn to shreds by a demon would, so she's only all too eager to get rid of the rift while they have the chance.