LO cannot sleep on her own

Hello! FTM here. Is it normal for LO to keep flexing arms during sleep? LO is currently 2.5 months. We tried to swaddle her but she dislike it so much that she would scream or cry out loud until we remove the swaddle. She is a freestyle sleeper lol .. However if we didnt swaddle her, she would flex her arms around when she is gonna sleep (which she couldn't sleep of course with her arms flexing around) and often needs help (e.g. People to pat her or people to carry her first n then put down onto the bed when in deep sleep) to get to sleep. And again, in the middle of her sleep, her arms would then flex around and she wakes herself up and cry. The only way to make her sleep longer is to put her on our chest. She loves to sleep on our chest but we do not want to make this a habit for her..