when did she come out of hospital? I had this issue for almost 10 days after my lo came out of hospital back in july. I was back and to to the doctors every day asking "when will someone help me, he is not eating/drinking anything".
Eventually he started up eating again after 10 days.
I think he was just shattered and even eating/drinking was too much hassle for him. If i was you, i would persever with offeering at your usual times, hopefully soon the eating will go back to normal. If it gets to the 2 week mark being out of hospital, get to see a doctor and explain the situation. But bear with it, your lo has been through a big ordeal with feeling crabby and all the hospital lights/poking etc. So hugs for you, its hard on mums too when lo's are ill!
Lili xx