What to do about being slandered on TripAdvisor by the management of a B&B I reviewed?

I criticised a few things about her B&B and complimented others. As she was not there during my stay, I couldn't point out the misgivings to her so I posted them on TripAdvisor instead. She tried to contact me on a private number a few times and left a voicemail saying that I should have taken it up with her, upon which she posted as a managerial response that I WET THE BED. This is an absolutely ridiculous accusation which I don't want to have attached to my TripAdvisor account. Is there a way of telling the management of the site that it should be taken down?