Desperate for help!

My 15 month old baby has not been getting enough sleep for a month now and it’s still going. She’ll sleep at 11pm sometimes 12 when she has a 2 hour nap during the day however today is so much worse. She only slept for 30mins around lunch and now she’s up and it’s almost 11pm.

I know she needs her sleep and she seems exhausted but refuses every time I try rock her to sleep or lay next to her. I am extremely exhausted and I’m about to breakdown as I feel that I’m not doing things correctly (first time mum)

At first I thought it was because of teething but this has been going on for too long now please advise.