Lily pees inside when raining

OK, I appreciate the advise, but I DO want to let you know she is not an untrained, uncrated little girl :) She is crated and has learned the command "go pee pee" and never poops in the house now either. In the motorhome she goes to the steps and sits down to let us know. She had only one accident and that was because we were not watching - haven't put the bell up at the door yet. I just can't figure out this thing of standing outside in the rain and playing, then come in and pee on the floor. I can take her out in the rain and she goes pee!! I am hoping she will stop this as she gets older. However, hearing about the Pom that has to have her own grass to poop on sounds like she has Lily beat!

Barb and the 4 chocolates