Definitely ask. I mean, if she's going to take money out of the deposit (a.k.a. bond, I only learned that word a few weeks ago when moving to Oz) she at least needs to tell you that.
Ditto PP that no way would that cost $500. Maybe she's just being slow about returning the deposit, in which case a friendly "Where's my money?" reminder won't hurt.
GL on getting your money back.