Intrusive mother in law- need a Christian opinion

My mother in law knows no boundaries and she can be VERY manipulative. I feel very much threatened by her because she acts like the mom to my oldest child. Its seems silly to say this but if you knew my MIL it wouldn't be silly. When my daughter was born my son had a difficult time adjusting (he would isolate himself a lot and sit by the window and just look out the window not talking to anyone even though we did everything to ease the transition) anyway, my mil would take him for long trips and or sleep overs to her place a lot. She sent me pictures of them hugging and him always sitting on her lap or holding hands and it broke my heart tbh. One of the pictures was of my son Smiling ear to ear in her and my father in laws car (they were on their way back to our place) the picture was sent to me and my sister in law who responded oh wow he must be coming home Bec he's so happy. Her response was "no he didn't want to go home he said he likes it at our place more" like how do you say something like that? There came a point where he really didn't want to come home to us and that's when I put my foot down. I felt like I was losing my son. I told my husband no more sleep overs and no more trips, he needs to learn that this is his home and his sister is a part of our lives. It's the only way he would get used to the new situation. So it's been about a month and a half since he slept over my mil house and guess what, my mother in law has been trying to literally force her way in so she can sleep over, mind you, she comes to our house EVERY Monday, wed, Thursday AND Saturday and Sunday!!! I'm already compromising with her coming over all these days even tho that has been a fight with my husband as well but no, in my husband's eyes, the situation is perfectly fine! And the things my MIL says so she can sleep over are just ridiculous! She words it so that she comes off innocent like she'll ask my son hey, maybe ill sleep over one day and naturally my son is like omg yes! Then she goes well it's up to your mom. Then says " I just want to sleep over Bec it makes him happy, what's wrong with that?" I refused to say anything each time and never officially said fine sleep over I just kept quiet so she tells my husband one day, "oh I can't even sleep over because no one allows it " so my husband felt sorry for her and told me we have to pick a day to let her sleep over. I really really didn't want to but the next day she asked me straight up if she can sleep over because there is rosary at our church. How do you say no to that? She ended up sleeping over and I'm like fine whatever this is the one and only time. When she was at church I did hw with my son, bathed him and his baby sister and made dinner for everyone. She was then really fussy (overly tired) so it took me a while to put her down. Usually I always put my son down to bed (on the days my husband has school- he recently went back for his MBA) but Bec I was with my daughter she put my son down. I walk in to say goodnight but they are already in bed and cuddling, holding hands and she's caressing his arm. I'm sorry but I got so jealous! I tell my son" baby you didn't hug us (me and his sister) goodnight and he didn't want to. They kept holding hands together😭 I get he's a kid and stuff but she could've easily ushered him to give us a hug but nothing came from her mouth. She didn't even look at us- she just kept staring into my sons eyes.Come this morning, she does everything with my son, feed him, dress him, brush his teeth and all the mean while talking to him ever so sweetly Like in her mommy tone. ✋🏻 me and my husband are perfectly capable of doing this but my husband is on cloud 9 Bec he doesn't have to do it. It's like he has two wives and my son has two moms. but I'm thinking ok, it's over, her one night sleeping over is done. But then She says, hey don't wash those covers Bec I want to sleep over again next week. I didn't say a word even tho I could've asked if they have rosary at her church in her neighborhood (20 min drive away).

Anyway, I feel like my soul is going to hell Bec I have so much anger when she's around. I don't feel like a good catholic. But All I want is some boundaries and a life to call our own. It's just toooo much!!!! I know God wants us to love each other and respect each other but I find it VERY DIFFICULT in these situations! Talking to my husband doesn't help Bec he doesn't see anything wrong so it always turns into a fight. So I am asking for input, and advice on how to take control of my marriage and kids but in a catholic/ Christian way. Thank you for taking the time in reading this if you made it this far.