I just need to vent and need some advice, i feel guilty for a decision i made and i want some input from people that dont know us personally, so.

Basically im married and have a 3 month old son with my husband, my husband has a 5 year old daughter with his ex. His ex completely hates my guts always has,always threatening me calling me names, at first there was so many issues i couldnt be around his daughter. Then it was like when she was in my home she used to say i couldnt brush her hair, help dress her or basically do anything etc etc. i was okay with it because well shes the mom, I respect it. So two years ago on my step daughter’s birthday she was being mean to a little one year old so i told her to “be nice” hes a baby, literally all i said, well she went home and told her mom i was being mean, the moms like ima beat your ass blah blah, like going so hard over it. I was never mean if any thing i go above and beyond for my stepdaughter. Mind you my step daughter calls me her babysitter and is constantly telling me her mom hates me and is going to beat me up. shes 5 years old so obviously i just ignore it what can i say, you kno. So a couple days ago her mom brung it up again and now i spoke to my hubby and told him that i am no longer staying with the baby becase she lies about things and i dont want any issues, and unfortunately there can be a really big problem. I have two kids that need my attention. Im a stay at home mom so his daughter stays with me for the week while he works.

So basically am i wrong to refuse to stay with his daughter while hubbys not home? Am i being selfish since im home and he get to spend more time with her ? 😔

One more thing she accused my 11 year old of

Pushing her off the bed, and my daughter said she didnt do it, my husband kept asking my daughter multiple times. If she did it😔 then casually over dinner shes like lexie didnt push me off. My husband didnt even apologize to my kid. , also she went and tried to hit my 2 month old because he was looking at her to much😔 my husband wasnt home. How can i even deal. Idk rant over. Tell me what you think.