proud step mom here

I think we need a step parent group on this app. Mainly because and no offense when I say this but if you are not a step parent you don't always understand what we go through. I love my step daughter very much and I do everything for her. However, recently dealing with her mom is becoming way too stressful. Her and I aren't like besties or anything but we were able to communicate like adults in person when it came to my step daughter. lately though at pick up and drop off (by the way we have to drive 4 hours round trip on our weekends to have her ) She says nothing. Now she has made parenting or life choices in the past that I may have not agreed with but it never bothered me like what she just did this weekend. So she is staying silent at pick up and drop off but when we got my step daughter Friday she handed me a piece of paper and said "my mom said to give this to you" one side was homework practice (no big deal) but the other side was a whole page note of telling me what my husband and I have to do at OUR house. First of all no one can tell us how to parent in our own house hold, my step daughter gets well fed, bathed, if she is sick she gets medicine, she gets taken care of and she loves being at our house. Second of all we are not in middle school passing notes let alone through a child. If I have a concern I confront her respectfully woman to woman like an adult with out my step daughter involved because she doesn't need to worry about our concerns with each other, she needs to worry about being a kid. All weekend this incident has bothered me and as we just dropped my step daughter off she still said nothing! At this point I'm done being the middle man because in my opinion if the shoe were on the other foot I would be so happy if my child had a step parent that loved them , and cared for them as if they were their own. I'm done being stressed about whatever she is trying to pull. She can talk to my husband about it (the reason I have been the middle man is because she was cheating on my now husband while he was serving our country and in the beginning they could not have a decent conversation ) However, my husband has learned to control what he's really thinking and been able to be decent to her. That being said they can deal with each other mean while I'm still going to be loving and supporting my step daughter as if she were mine like I have been the past 3 years. Any other step moms/parents out there?