I’m losing my character

I am writing a Romantasy book that has four POV’s. At first my main female protagonist came easily to me. She is the main POV for the first few chapters of the book and I felt I knew her really well it was the rest of the characters that I was feeling out. Well now I’m about 1/3 of the way through the rough draft and I have no idea who she is anymore. The other three have flourished and become their own characters, even separate from my original intentions. I get excited to write them and their voices feel distinct with flaws and I just love seeing how they’ll write themselves. But my FMC is lost to me. My writer friend says she thinks I put too much of myself in her and now I’m struggling with letting her grow into her own person, which is probably very true. So I guess my question is, how do I rediscover my character? Are there questions I should be asking myself or do I need to just go all the way back to the drawing board? She’s supposed to be a very pivotal character but right now she is acting as set dressing for more engaging characters.

TLDR; I lost the connection with my main character and need help getting it back.