Not sleeping through the night

My daughter used to sleep through the nights just fine now I can’t recall more than a night or two within the past couple months that she doesn’t wind up in our bed. Last night she went to bed around 8:30-8:45ish. Woke back up around 11. I put her back in her bed once she fell asleep close to midnight and sometime between then and like 2 she ended up in our bed again 😩 any advice I’m at a loss and we have a 6 week old so I’m exhausted.