Blanket/lovey struggle

My MIL got my daughter hooked to a blanket all the times she’s babysat. (I made the mistake of leaving one out and she just thought my daughter needed it to sleep. I guess I should’ve told her no blankets for sleeping.) She thinks she has to absolutely have a blanket to sleep and I didn’t want my daughter sleeping with blankets for safety reasons of course, and I told her that. I’m now transitioning my daughter from her bassinet to her own room in her crib. I’ve tried all day to get her to nap without her elephant lovey or blanket or I’ve taken them away once she’s asleep, but she notices and wakes up screaming and I give it back and she’ll be fine. I told my MIL no more blankets because I’m trying to get her to sleep with just a sleep sack on. She gets the blankets near her face and wants the blanket near her face, it just worries me. My mil was like “well she doesn’t need to be cold” I’m like she’s not cold. She had the nerve one day to say “grandma got her hooked on blankets, you’re welcome. She’s just like me, loves her warm, soft blankets.” and I was like “it’s actually not safe for her to sleep with blankets, so blankets won’t be used until she’s old enough and it’s safe to use them. She can suffocate.” I just hid all the blankets and she hasn’t been babysitting. My daughter always has warm clothes on, I keep the temperature in the house comfortable. I make sure she’s not cold. Now I’m a paranoid mess and trying to get my daughter to sleep without a blanket near her face. 😩 it’s been a struggle! I just took the blanket away once she got to sleep, it’s been about 10 minutes and no waking up screaming yet. Has anyone else had this problem? What did you do? I’m just terrified of her suffocating and I know it’s not safe.