Ohkay so I need help....

Don't know if I done the right thing or if I should have just left it alone.

My fiancés brothers wife just found out she is pregnant, we don't get along what so ever. She always tries to put do my fiancé and myself. When we found out that we were expecting our little guy she immediately started trying to have a baby, then we started discussing marriage and she had to get engaged and start planning her wedding for sooner than ours, I wanted a new car she made her fiancé go buy her one, we talked about a new truck she made her fiancé buy the best of the best. It's like she just can't stop trying to be better than us. Well we were at this concert thing and her aunt walked up and I informed her that I didn't care who she was but I let her know her niece didn't like me much and her aunt went back and told her I said all this stuff when in reality I didn't say anything but that she doesn't like me and its the truth. Well tonight I texted her and told her congrats on the baby and thanked her for helping me after I had my little one because she helped me get in and out the tub and she helped bathe him and took me to the hospital when I had the flu and my son was only 3 weeks old and she's brought us to many of doctors appointments for my son. I just don't want the drama anymore and I know if she starts coming around again that's all it's going to be. I am very happy that they finally got pregnant but I don't know if I should have just let it be or what. Kinda stuck in the middle because my son has to have his uncle and as long as me and his aunt are fighting and not getting along then it's just going to make my son miss a major part of his life. :( 🙁🙁guess all things happen for a reason.