My mother

Ok, so not sure what to do. I got pregnant at 17, had my son at 18. I am now 19 years old and have been with my SO for going on 3 years now. We have our own place, both have steady jobs, and take very good care of our son. This weekend I came down with the flu. The prior week to this, I had strep. My one year old son caught it and had to be rushed to the ER because he was running a 103 fever. So this week, he has been staying with my SO'S brother and his girlfriend. My grandmother called to check up on me and asked about my son, and I told her where he was until I wasn't contagious anymore. Well, she called my mother and told her and my mother called me and told me she was very upset with me and basically told me I was a horrible parent because she didn't know my SO'S brother and that I should have kept the baby home because she did with me and my brother when she was sick. This isn't the first time my mom has done something like this. Ever since he was born, she has pretty much tried to tell me what I can and cannot do with my own child. It even escalated to the point we had to call the police and get a temporary restraint put out on my step dad because she sent him over to our house, had him try to take my son, and then called the police and told them we were living in filth and had liquor in the house and was drinking around the baby. None of this was true, the cop who came to investigate even said they were crazy. But I just don't know what to do at this point. She constantly tries to run my child's life and my own. She hates my SO to the point she made every attempt to split us up and even went as far to tell me she didn't give a shit if I was happy. She was even pissed off at me when I moved out and got my own place. I love my mother, and I don't want her to not be in my life, but a person can only take so much negativity in their life. I don't know what to do. I've suggested counseling and that was a no go so I'm out of ideas. Thoughts?