ah, now the bar question has a little more info behind it.
first off, the problem isn't the child's. it's yours. she's been raised by her grandmothers, so why WOULD she see you as a parent?
you say her grandmothers never disciplined her. but she listens to them, so clearly they did.
you say they have a no discipline 'rule' and overstep you and your husband. how precisely does that happen if the child lives with you?
you and your husband need to go see a family counselor and get on the same page about putting together a family philosophy and how to parent this confused and upset little girl. she's going through a bewildering and scary upheaval. she needs support, and yes, clear and sensible boundaries. not disapproval and punishment.
just blaming her for not listening and complaining about her isn't helpful. she's not the problem.
you also have to take a deep breath and a big fat step back. being a stepmother means taking the back seat. the grandmothers have been raising her and DO have a say, and a huge emotional investment in her. you waltzing in now with criticisms and new rules is not going to fly well with anyone, first and foremost with your stepdaughter.
her father needs figure this out fast, and step firmly and lovingly and patiently into the primary parent role.
the grandmothers need to be kept in the loop.
you are support staff. it may rankle, but if you're smart you'll quit trying to run the show.
and if you're REALLY smart you'll go to the grandmothers and ask for their help and advice.
khairete
S.