It's more than most people have given her in her life. She doesn't need an apology when his actions speak louder than the words possibly could. One can offer apologies and cite changed ways that are actually set in stone.

"We've come all this way already," she begins after a moment of consideration. "If you're okay with going, we might as well. Because... honestly, I don't have any other ideas."

If this isn't the Porter, if they're stuck here in this twisted version of the world, she doesn't know what to do. The mutants here won't know her, she has no human friends to rely on, and she can't even begin to guess at how they might get back to the world they'd shared. It's scary to admit but she isn't going to put on false bravado with him.