That's important, because those with HD tend to change psychologically. My husband has a short fuse and gets mad easily. However, he is never abusive or aggressive with me or anyone else and has always been this way. He just loses his temper at times. If he chooses to be tested, that's the only sure way to know.
Testing is a complicated issue in itself.
The best thing to do is help your daughter educate herself about HD, if she hasn't already. That way she knows the warning signs and has the information ready, if and when she needs it. Also, she will need a support system either through the family or through a support group. Try to be there for her if she wants to talk. Even though some with HD do become aggressive or abusive, it cannot be tolerated.