OHMIGOSH!!!
I was about to post a message that would have been almost identical to yours. My 7 year old daughter even uses the exact same words. I feel like I've tried almost everything.
I understand what you mean by wanting to 'get along'. I have never tried to be my daughter's friend, but having one day without major conflict would sure be nice.
If you find anything that works, let me know. I'll do the same for you, if anything seems to help.