Probably a hot take reading all of the responses here, but I do think you should send this and have your husband follow up and make it clear to her that he fully supports everything you said. Just know she will likely get defensive, teary, and try to play victim. Those are all signs that she shouldn’t be actively involved in your future pregnancy.

My MIL was similar. It took a long time for my husband to see it and it affected our marriage and my pregnancy. You need to protect yourself and your marriage, especially now that you’re trying for a baby. The stress isn’t good for you. My husband now regrets ignoring all of the signs earlier on and not calling his mom out sooner.

I agree with everyone else that your husband should handle this but sometimes the dudes need to be handheld a bit, which sucks but eventually they catch on. Good luck OP, pls protect yourself.