Is she a baby, a yearling or a fully mature BP? How much weight (or percentage of her body weight) do you think she's lost?

We had an adult female get lost in our big old 100 year old home for 4 months. She lost a very small amount of weight but like yours was nervous and very thirsty at first. I'd suggest you just keep yours warm, offer water, monitor her for any signs of illness (RI, etc.) and try a smaller than normal meal in about a week. If she eats and has no problems digesting then feed every 7 days gradually increasing her meals in size until she's back on her normal feeding pattern.