Safe sleep for baby

My baby is soon to be 8 months old. We have bed shared most of the time (I know... bad...) it was the only way to get her to sleep soundly. Well, since bed sharing, she usually would be covered up with a fuzzy blanket on her lower half and snuggled up close to me. Well now we finally got her to sleep in her crib, but she refuses to without a blanket... she does wear her owlet smart sock monitor, and we gave her a crochet blanket instead of a fuzzy one, but I'm curious if anyone has broken sleep habits like this before? Do you think a sleep sack would be close enough to a blanket to comfort her? I cant sleep at night because I'm scared shes going to pull the blanket over her face!!!