HELP...8.5 month old still waking up every 3 hours

My baby was a good sleeper with only waking up once at night to eat. Since 7.5 months she’s been waking up every 3 hours. Sometimes I will breastfeed her and she goes back to sleep, while other times I need to rock her back to sleep. She is teething like crazy, she has her 8th tooth coming out now. I’m just so exhausted I need some advice, she hasn’t slept threw the night once! She sleeps in the same room as us but in her crib.

- is it just the teething

- could it be a sleep regression (but it’s been a whole month)

- should we move her to her own room and sleep train

This very tired mama would appreciate your advice!