I am so sorry, this is horribly worrying
for you, you may want to try putting this onto the expert/Doctor forum
for better answers, I think at this presant time as she is in hospital all you can do is realise they will find a reason, and insist they keep her until you do have an answer, this will probably be too simple , but as you are breast feeding what do you eat as a rule I have known Mothers whose babies have been allergic to the Moms milk due to Mom eating something baby was allergic to, t