This is a question to ask your therapist. No one here can answer for her.

She can't "make'' you do anything but it is her prerogative to make decisions according to her personal boundaries regarding her health and/or physical integrity - as well as that of her *other* clients who share the same physical space.

Typically, clients would be mindful of not wanting to expose their therapist to whatever they may have. Continually throwing up in the therapist's office and still wanting come in person is not considerate of her, nor of those other people who come in person and breathe the same air.