K.K.
I feel your pain! You need sleep!!!
I am not an expert....but I say, let her sleep with you so you get some sleep. There will be a day where she doesn't even want to look at her parents, so let her be close to you now when she needs to. Give her what she seems to be needing, and perhaps the need will go away.
It could be anxiety about the new baby.
Is she still napping? Maybe her naps are too long?
Have you tried music in her room? We did this with my 31/2 year old. The music cues her to fall asleep. Now when she wakes up in the night, I can hear her put her music on, and sometimes she still climbs in bed with us. I think she does it only on nights when the day has been big- Halloween was a big deal, so we found her in our bed this morning.
GOOD LUCK. Many many people let their kids sleep with them. If it works for you family, it works for your family.