I wish my best friend would leave her family
Do you not like your best friend's family?
Yeah, they're super controlling. Even to people outside of their faimily they try to boss them around.
If your friends' parents are like that then I can understand why you feel that way. It's pretty normal to want to help your friends/ Wanting what's best for them is great but there are some things you should probably stay out of like family issues.
I just really want her to leave her family.
I understand where you are coming from, but it's her decision alone as it's her family.