It seems like the humidity is spot on, and if she is eating then it is unlikely she is an expectant mother. The OP has said there are no mites. Can any other members chime in here? What else could cause the excessive soaking??

Also, does she have an identical hide on the cool and warm side? Maybe she likes the security and temperature of her water bowl compared to her hide. Make sure her hides are snug (REALLY snug) and that she has one on the cool and warm side.

JonV