Please - I understand your concern - A few things to note...
When the guts aren't in great order, it's hard for the body to fight off infections.
Prednisone also increases the chance of infection.
The lung complication that was discussed is EXTREMELY rare.
It can take a UCer a longer time to recover from illness, especially if the UCer was recently flaring or is currently flaring.
That being said, I would keep an eye on it. The repiratory infections going around this year are very tough. I've had a couple of co-workers who needed shots of antibiotics and prednisone along with a z-pack to get over them.
I hope your daughter feels better soon.
Pan-colitis and GERD diagnosed May 2003
Osteopenia diagnosed Feb 2006
Asacol 12 per day, Azathioprine 75mg, Aciphex, Effexor XR, Forvia and a Probiotic