Sleep training

Trying to sleep train my daughter and get her to learn how to self soothe. Tonight was night 1😬 she struggled for about an hour and she just now rolled over on her belly and went to sleep with her white noise machine on and a pacifier. She falls asleep with a blanket easily but I take it away once she’s asleep because it’s the only way she’ll sleep (my MIL got her dependent on it 🙄) But she’s in her bassinet and she rolls and doesn’t have much room in there so I’m scared of her getting stuck. She can roll both ways and lift her head easily and move around but I’m still nervous because she’s in her bassinet and not her crib so she doesn’t have as much room.😩 I know she had enough room to roll on her belly so maybe she has room to roll back if she needs to? I’m just terrified of her suffocating. Her pediatrician said once she can roll and has great head control she’s safe but ugh I’m still paranoid!