I had a 36 weeker and we used his adjusted age for about a year. He was 36 weeks to the day by scan dating, (but imo maybe a bit under that!?).
I had to wake him to nurse about every 15 mins for around 3 months. LOL. It might not have been quite that often, but it's not far off. The jaundice took 3 months to clear up, and after that things improved. He had tests on his liver function etc and all came back fine, but you may want to get that checked out, ( am fairly sure health professionals will be looking out for that anyway?) He's the only child of mine who had vit K, ( under pressure), and I wonder if this was part of the difficulty anyway.
He also didn't smile for 3 months - which I found very, very difficult to deal with tbh. I would look at him and be waiting for the light to dawn at his window eyes if that makes sense. Poor baby didn't have so many smiles from me coming his way though as I was quite depressed at that time.
So, it sounds normal, but do make sure she's not going too long without sips of milk. I intended for me to be my boy's incubator/ drip until he was past the first difficult months. We had one pointless supplemental (expressed b'milk down a tube), feed when we were readmitted for the bilibed, but otherwise mama drip by drip care was totally worth it.
Maybe take a look at kangaroomothercare.com
HUGS to you and congratulations