This intensive program is for you. For you. So do what is best for you. "No" is a complete answer.
I participated in a similar program, and while it was life changing for me it was also completely exhausting. I could not have shared a room with anyone.
If she wants to go, let her make her own arrangements. She can contact the facility and get the information she needs. You don't need to be responsible for her.
Take care of you.