Mine is the same! We recently found out he's allergic to cheese (he loved cheese). Tried him with vegan cheese but he won't eat it. He won't eat any fruit unless we hide it in porridge. He'll sometimes eat pureed veg but even that is very hit & miss. I constantly worry that he has a terrible diet. I was hoping he'd be less picky than his sister but he actually seems to be worse at the moment :/
Likely not what you want to hear, but unfortunately what you've described is just a part of raising babies. She might be having a growth spurt or pushing out teeth. That often puts them off food and affects sleep. Everything is a phase. It will get better. You just have to be consistent and patient.