What to do when a parent stops child access for another

I am the father of two children, a son and daughter. My son is eight-years-old and my daughter is 13. I separated from their mother around six years ago, and since separation things have been amicable between us, with some general bickering every now and then.

- Legal Eagle with Andrew Freckleton

However, a few days ago when I was having time with the children, suddenly my daughter got emotional and angry with me, and said she wanted to go back to her mother's house.

I tried asking her why, but she couldn't seem to tell me. I didn't want to cause a fuss, so I took her back home.

The mother has since told me that I won't be seeing my daughter again because of how upset she was in my care. I am still allowed to see my son as normal. What can I do about my daughter?

I am worried she has been influenced by her mother. My daughter has never acted like this before in my care.