In the last month I've had 2 escapes. The first 4 out of 10 got out, but didn't make it very far. I found all four of them next to the tank being pawed at by my declawed cat, Tiger, they were all fine.
Several days ago I had the second escape, 2 got out. One was still next to the escape route on the tank and the other was under the stove. We found that one because Buster, another cat, was pacing, pawing and howling in front of it. It too was engulfed in fur, bloated to the point it could have floated, dry as the desert and looked dead. Thank the frog Gods after I meticulously removed the fur and gave him/her a good soaking froggy has deflated and is also just fine. Both times I found them very shortly after their escapes, probably less than 12 hours.
I think the reason froggy was under the stove was because it was heading to the sliding back glass door. I assume it was going to the glass door try to find it's way out, but got waylaid by the cats or realized it couldn't get through the glass!
Do you have any windows? Check around there and if you have blinds or a curtains open them and leave a bowl of water there too. Also check shelves, around the bed and headboard, under your dressers, look around the tank and anything green, mine seem to gravitate towards green stuff!
I hope you find her soon and hopefully she will find the water. Please let us know because I know I'll keep wondering what going on and if she's ok.
BTW.. Did you say you have your White's and BETF in the same tank? If you do you may want to consider getting another tank so each species has their own. I myself had inadvertantly took in a Spring Peeper froglet, while selecting Gray Tree froglets to take in as pets. I was told that different frogs have their own secretions that can be toxic to other frogs and mixing species is a no, no! I let the peeper go, reluctantly, since, at the time, I didn't have another tank and they will peep even if they are kept at a constant temp and humidity. Sorry Peeper!