Toddler refuses to stay in her bed...

Help I’m at a loss :( my daughter will be 3 in just a few short months. She has been sleeping in her own bed for a year and a half, a toddler bed and now she’s had a twin size bed since her 2nd birthday. She always goes to sleep in her bed and comes into ours around 5 am which we don’t mind, her dad goes to work and she sleeps with me from then on....

my sister was living with us and is now leaving for college, so my daughter is getting her room. It’s bigger and originally was supposed to be hers. Here’s where I have the problem.

We switched the rooms and my daughter LOVES the idea of it, she plays in there all day, all her things are in there, everything. But when it comes time for bed she absolutely hates it. I mean HAATTTEES it. She couldn’t get the door open the first night and ended up banging her head off the door 😭😭😭 it was awful. She went through this for 2-3 nights when she got her old room at first, but now it’s way worse. Hitting screaming meltdowns. She made herself throw up in bed before I even left the room tonight, so she’s in our bed. Has anyone else dealt with this? What do I do? I really need her back in her own bed as I’m pregnant and very uncomfortable with her taking up most the space.