As a rule females learn languages better than males and males learn mathematics better than languages.
I am curious why your daughter learned 9 languages.
First of all children should learn the native spoken language of their parents.
That way the learn the idea of grammar, also they live traditions and a feeling of belonging.
If the parents are native speakers in different languages the children can easily learn two - the one from their father and the other one from their mother.
In case a family speaks one/two languages at home and a third one outside the home that is where the child picks up a third language in daycare, school and from friends.