3 mo old prefers side sleeping

So my 3 month old has figured out how to roll to her side from her back while sleeping. Is it safe to let her sleep that way if she gets herself there? She can’t get to her tummy yet but I switched her to an arms out sleep sack a week ago.

If I try to roll her to her back on her back she wakes and cries and rolls back to her side.

She lays on the same side I laid on all pregnancy which I think is interesting. I laid on my right side from 20 weeks until she was born and now she prefers sleeping on her right side.