Baby suddenly become fussy and crying alot..

Hi moms! My baby is almost 11 months old, she has always been a very Happy and fuss free baby till a week back, she got a fever and since then she is very irritable, cranky and keeps crying very often (many times it sounds forced and fake) she already has 8 teeth and she has never been like this while teething also. I'm super confused and don't know how to figure out what's bothering her, her fever is gone, I co sleep and breastfeed so it's not like I'm keeping her away from me, she did start going to day care 4 weeks back but she was doing well there as well but now when she sees me while pick up she starts crying but if her dad picks her up she is fine. I need help, I feel lost.