Try keeping her in a bathroom for a few days, with litterbox and
food/water....

Well, it was an improvement last night. She threw up on the bed - but I had a
hefty garbage bag (covering the pee area of the 2 nights) and she didn't get
any on the mattress. She peed in the litterbox (but since it was, then, dirty,
she deficated outside the box. Hopefully, tonight it'll be all in the
box...I'll watch more carefully.