She nods a little at his offer to get her food. She's not sure she'll be able to eat, but she has enough presence of mind now to know that she should probably try. And Ted would be right back.

She pauses at the second question, then nods again. Sherlock sat with her after Andrew died, and since coming to London he's seen her desperately ill. They've become even closer thanks to Ted working with him to keep Joan safe. She'll let him see her, care for her.