Sorry I missed this. I do not think there is much you could have done once she escaped, once they get out you have to find them fast. She could have been injured during the fall, or damaged somehow while out of the tank, there is really no way to know.

I had a frog that did the same thing, I was just a bit luckier and found her uninjured. You did the right thing though to place her in some water so she could rehydrate herself and regain strength.

All you can really do is as Carlos said and to make sure the lid is 100% secure. Here is how I keep my ACF secure, I use a glass lid and a canister filter, the plastic backing of the glass lid is fit snug to the canister tubing. Since I've had this set up, I've had no escapes. You may also want to lower the water level a bit, 3"-4" works.