10 month old not letting mommy go during nap

My baby girl is 10 month. She's always been sleeping separately from us, and been in her own room since she was 2 month just fine. But for a couple of days now she won't nap without me... she would sleep 20 min, wake up and cry until I take her in my arms. As soon as I get her, she lays down on me and falls back asleep. I tried putting her back in her crib, but she just grabs me so hard and pushes herself into me and not letting me go... if I manage to put her down, she opens her eyes and has a look as if she's so scared of something, until I take her in my arms again... she will sleep if I lay down with her, but she has to hug me really tight... we also just reduced nursing sessions for the day, but it doesn't look like she is missing the boob, cuz we are doing it slowly and comfortably. Can anyone tell me what is going on and what can I do about it? She's also always been mommys girl, but for past 2 weeks she doesn't let me go out of her sight at all, even if her daddy is holding her, she would search for me just to make sure I'm still there, and she absolutely loves her daddy. I'm sorry this is so long, but I wanted to describe the situation the best I can. Does anyone have an advice for how to make her sleep piecefully in her crib again?