Dancer gives me $20 back and buys me a shot

This girl must have been really drunk. She admitted to being "tipsy", but I think she had crossed into drunken territory pretty quickly. I take her to VIP. She said she wanted to talk about it first. I knew she was gonna want big payment for just 30 mins in VIP, but we never did. I buy 3 dances from her and she then tells me she usually charges $150-200 for VIP. I apologized and told her I only had $80. I pay her $60 for the dances ($20 a pop). She tells me she felt bad about not telling me beforehand abou the $150 thing, then proceeds to GIVE me $20 back. I reluctantly took it, but that struck me as odd.