[Partly, but she's also upset in the way older relatives get annoyed when the whippersnappers get rowdy in public. They never formalised the relationship between what was left of the Wen Clan and Wei Wuxian, but Wei Wuxian's basically adopted.]

He is a child- he needs to learn restraint, or he'll get into trouble. [like the many times he has in canon.]

More than he already has. I'm grateful that you've been generous with him; many people aren't.