How my mother became a toxic person.

Ellie • Abbigail Mae • 01.14.17 • Finnegan Jakob : 01.28.18 : /09.27.19 Tessa Elise /🥰🌼
Growing up my mother was very good to me, and by no means is she an evil person now. However, there is extremely toxic behavior she can exude that didn't become a problem until I was a teen.
She has a best friend, whom feels like she can comment on whatever I do. Or what my husband says/does. Both of them do not like my husband, my mother only doesn't like him because my husband does not hold back his feelings and does not filter himself (unless I've asked him to.) and because her best friend doesn't, of course.
The best friend in the past 9 months of my pregnancy has: commented on specific things in my pregnancy such as my daughters name, her last name (which will be her daddy's) and must insert herself in every situation. I had threatened preterm labor and so because my mothers car was down the best friend drove my mom to the hospital. She was supposed to drop off and leave, of course she didn't. 😒. Whatever, fine. I get over that. Next day my mom says she needs to go home, fine my husband brings her. The whole time my mom was there she was bitching every time I asked for my husband asking why she was even there and made the entire thing about her. And when I discharged myself after 3 days of sitting there and having nothing changed, she put up a Facebook status basically calling me selfish without names. At this point I called because I was livid and reamed her a new one because there's no reason for that and she straight out admitted yeah it was about me but "no one else knew that." Like that matters, I told her to take it down and she said she would (lies, never did. Just put up another one saying she wasn't commenting on the previous, which means she was talking shit in messenger). She got pissed off and eventually I calmed down, called her and then talked it out. I went home and it then dawned on me I have been seeking approval from a woman who is no longer acting like my mother. 
The best friend has messaged me about my mothers depression, how it bugs my mom I chose to have the baby in New Hampshire where I now live vs closer to her, and how I'm never around. The drive is an hour and 45 minutes away from me, so no I'm not around constantly. I also don't have my license (due to not having the funds) and my husband is constantly working. I have been attacked over time this whole pregnancy all over how a grown woman is feeling. I've warned her that if anything is said in front of my daughter about her father or I that is even slightly disrespectful it will be the last time she sees her. Even a joke. 
I love my mother to death, but she can be a very toxic person due to her being all about her best friend. 
Anyone else have a similar situation?