It was weird when Scooter stopped using the water bottles. We assumed it was because the cold water hurt, but we were never sure. When Scooter first became ill just after Punkin did that September, he never touched the water bottle again for just over 3 months. That changed when he was introduced to Leo. Like, instantly. He was in the introduction pen with Leo when he started again.
Similarly, he stopped when he fell ill again the next February and again, didn't touch it for months. And again, just like flipping a switch, he started using them again. This was about 3 weeks before I lost him.
I wish I had something I could tell you to try that would work, but I don't. I tried everything I could think of, short of switching to a bowl.
I'm just hoping she's feeling better soon and back to normal.