Have name changed for this.
Me and ex have a daughter who will be 4 in July. Lately when I am going to take her for a bath and her father is down, she has been saying that she doesn't want him to come upstairs and tells him to wait downstairs. This came from nowhere as he has been present numerous times for bath time before without issue.
One time when it first started happening, we did it so I took her into the bathroom first and he came in later. She started crying, pushing him out of the bathroom and closing the door.
After bath time, she will happily run around naked downstairs in front of him. She loves her dad and I know nothing untoward has happened. She is fine with him taking her to toilet.
Just looking for advice on how to deal with this.