Advice to help me decide if I should bring it up or not...MIL probs

I have never had an issue with my mother in law. She has always been fine. We aren't close though, I have more in depth conversations with my FIL. But lately her true colors are starting to come out.

We have a 2.5 year old and a now 10 week old. (April Baby) we weren't married yet., so in February we decided to get married. We could not tell​ anyone though because due to family issues my father would have cut me off health insurance had he found out and my husband's insurance didn't kick in until April. So we had secret wedding I guess you would call it with just my mom and grandparents and his parents. Well come to find out, it was the same day as a surprise engagement party that my mom threw me. So my mom had received addresses from my MIL to invite friends and family. (The whole time I guess my MIL was pissed because she thinks it is wrong to keep secrets even if it means for a party or even to ensure her grandson isn't born without insurance)

Anyway, about a month later my mom wanted to throw me a surprise sprinkle (a get together to celebrate the baby but not get gifts because we have everything from baby #1). My mom had sent out the invitations and then contacted my MIL to see if she was interested in bringing a little something (because she always likes to bring something to parties) and my MIL blew up on my mom. Saying, "why did you use the address list I gave you for the engagement party" "you should have destroyed it" "you have no right to use that list for another party" "throw it away right now" "why don't you invite your own family" (which we don't have anymore because my parents are getting a divorce and it turned ugly and I basically am only in contact with my mom and her parents, so we have no family to invite)

Then on the day of the party, only my MIL and her SIL showed up, no one else even RSVPed. Which really hurt my moms feelings because she was so excited to throw me a shower since she didn't get to with the first baby.

Anyway, yesterday I found an invitation for my MIL's neighbor for the shower (which was 3 mi the ago). SHE NEVER gave it to her!!! (We send her invitations to my MIL because she said it is easier that way, but have never had a problem in the past)

Now I am wondering if my MIL told everyone not to come to the party and that's why no one even RSVPed. I even had a sip and see a few weeks after the baby was born to introduce the baby and when everyone got to learn the gender and name. I invited 50 people and only 10 people showed up. (This party was at my MIL's house due to the size) So I really feel like something is going on with my MIL. I am not sure if I should bring it up to my husband (he is very protective and thinks i over reacte too much) or to my MIL

I am really at a loss because I didn't think we had a problem and now I can't even stand to be around her because I am so hurt.

What do I do??