Hi ulyssiamantee ! I can understand what you feel as you care about her. If you blame some one on the basis of doubt but no evidence will only create tension. So ! Ask her politely or ask with some other with whom she talk most. About bruise
on thigh can occur during play or internal disorder. If a person did once and if he is free, he do again. Be in close emotional contact with her and you will know. but if you want to sue need evidence. Be safe bye.