She should NOT have been rude to you, I would be so happy to reunite a dog with their owner... she may have started to fall in love over night and therefore she is upset that she now has to return the pup, this is no excuse for her actions but sometimes people let their emotions take over.
I would reimburse her the cost of the grooming and maybe a little something extra for keeping the dog safe overnight.
So glad you are getting a happy ending!
