As the mother of an aspiring ballerina, I would definitely have your daughter see a doctor and get that ankle checked out. Tell the doc about your daughters’ activities at school and ballet class. Also, talk to your daughters’ ballet teacher about the pain in her ankle. Her ballet teachers should be keeping a close eye on their pointe students. If your daughter has injured her foot or ankle in any way, I am sure her teacher would want to know. They would lighten her classes or have her do soft-shoe workouts until her foot/ankle heals.
" I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent." Mahatma Gandhi
"This is the ultimate weakness of violence: It multiplies evil and violence in the universe. It doesn't solve any problems." Martin Luther King, Jr.