I'm so upset with my ex-girlfriend, she took all of the clothes I bought for my daughter.
That sounds awful, why would she take all the clothes you bought for your daughter?
She hates me and she's trying to get back at me for ending the relationship.
You should call the police and report her behavior if she's stealing things from you and your daughter. It's not appropriate for her to take things that belong to you and your family.
That might make her really angry, I'm not sure if I should report her.
I know you're uncertain about what to do, but her behavior could escalate if you don't report her behavior. Take legal actions to put a stop to her destructive behavior.