Great to hear! It sounds like she's been welcomed into a nice home .

Here is a great article about pigments and colors in humans and animals.
http://www.webexhibits.org/causesofcolor/7I.html

I've done some further research after being intrigued by your frog. She does not seem to fit the proper leucistic profile. I think she may have a piebald mutation.

http://en.m.wikipedia.org/wiki/Piebaldism

I find it amazing that you found her out of all of the bullfrogs there! Truly lucky!

I am doing more research and will update if I can find anything useful for you.