Foster Daighter trying to get case worker to back her...

Kinda sounds like a normal 8 year old! lol Substitute CW for Grandma and you'd have a situation I've seen play out in my extended family many times. :-) GRANDMA said I could and you have to listen to her because she's YOUR MOM! lolI'd definitely address it, but I'd also realize negotiating boundaries and relationships is a healthy and normal part of growing up. The most important part is teaching her the correct way to negotiate those boundaries. :-) She needs to be "set straight" about how these particular boundaries work. :-)ETA: You might want to even consider inviting the CW over and having the conversation with her and her CW present to make sure she understands she can't manipulate the adults. Nip it in the bud (so to speak) while she's young. ;-)