Mother in Law rant!

My mother in law has done so many rude or mean things to me...
-Before my husband and I got married she made it very clear that she did not want us to get married so soon and that we needed to wait. We were together a 1.5 years when he proposed got married 6 months later (maybe this is why she hates me 😂😂😂)
-she stole the gift I was going to give my SIL for her baby shower, long story short she asked me 100 times what I was going to get her and when I finally caved and told her she ordered it before I had the chance, then gave me a wicked smile when my SIL opened it. 
-evil looks all the time, becoming more frequent.
-rude comments. 
-telling me what I can and cannot do... 
It may sound childish but she's starting to push me to my limit. 
Sometimes it makes me feel like I'm the problem instead of her!
I've also been as nice and polite as I can to her! I invited her shopping with my mother and myself which she came to and of course put on her halo. I always offer to help/actually help clean up after dinner, I always bring something anytime they have a party (which is often) I ALWAYS let them know about Dr appointments and send them pictures after ultra sounds. 
We watch their psycho dog anytime they leave on a spur of the moment trip (at least once a month they call on Thursday night asking us to watch her for the weekend and we are stuck in the house with her because she will tear things up if we leave!) 
We come over every Sunday night for a family dinner and always end up staying for at least 6+ hours (kill me).
I definitely think she knows that my husband won't believe me when I tell him what she has done and I feel horrible talking to him about her! I just feel attacked on a regular basis now and it's getting worse and worse. Im dreading how she is going to act after I have the baby in July. Thank god my husband isn't a mammas boy and doesn't need to talk to her all the time. 
Sorry for the long post, just needed to let it out!