Am I the problem?

So I should start by saying I never used to have an issue with my MIL. It all started when I got pregnant (I now have a 1 year old). I live in Australia with my partner - he is Australian and his family is. I have no family here.

When I was pregnant, my mom got really sick. This is when my MIL got on my nerves. We were out for dinner and I was talking about how stressed I am about my mom. She had tears in her eyes - however started saying how SHES upset because I’m probably going to take her only grandchild and move back home to be with my mom. So insanely insensitive that she made this about her. There were many instances like this.

She also would make comments like.. I saw a photo of your mom and she doesn’t LOOK that sick. Etc. drove me nuts.

Anyway - my mom has now passed away. And so much of my anger is toward my MIL. She messaged me when my mom passed away, however when I got back to Australia she never said anything (I guess she feels too uncomfortable so tries to act like nothing happened). every little thing she does pisses me off. The sound of her voice pisses me off. And sometimes I wonder if she actually has good intentions some of the time but I just can’t see it. She loves my son and she tries to be helpful but I just can’t let go of the grudge I’m holding and I hate seeing her get to be a grandma when that opportunity was ripped away from my own mom

It’s tough because I could actually use the help - being a SAHM is tough.

My therapist says I should talk to her about my feelings but omg I just don’t want to open that can of worms and I’m second guessing if I’m the problem.