You're my friend. Of course I'd be concerned. [ He knows it was hard for Liz to accept that her daughter's a vampire and they had to compel her to forget the first time she'd found out about it, but it's a good thing she's come to sort of accept that. After all, it's not like Caroline ever chose this for herself. It was Katherine's doing. ]
Your daughter might be a vampire, but she's still one of the good ones. You must have done something right.