I'll be the voice of dissention here. I often lift the water bowl up at 8:00. I give Shelby a drink of fresh water and then the bowl goes up. I can't have her drinking water an hour before going to bed, she will pee the bed. Same as I don't drink a big glass of wate before going to bed but will have a big glass an hour before. But she is really good about taking a good drink of water with her last of the evening bowl.
I think the problem here is not her drinking water but drinking so much and having accidents. I do think I would talk to the vet and if you aren't getting a satisfactory answer, ask for another opinion.
Refresh my memory Emma...how old is Bluebell?
Loving mom to Jake, Shelby and Micah