Aww poor thing
My son had it at 16 months old, and it was awful I was so worried. We took him to the Dr as he was weezing and breathing fast, had a high temp and was just generally unwell. He was put on the nebulizer and that helped, but we ended up back at the Dr that night and then to the hospital.
They have him some stuff starting with P..umm prenizone?(lol its something like that anyways) and that helped heaps.
he got it again a few months later but not as bad, but I still took him to the dr and got him checked out.
Have they sent you home with some ventolin and a spacer? Thats what the hospital gave us, and we have it on hand nowdays just in case, as he still gets weezy sometimes with a cold.
Just try and keep her temp down, stagger pamol with nurofen, as i find nurofen works better at keeping the temp down and pamol helps more with the cold/flu symptoms, keep her fluids up and if you are really worried still then take her back to the Dr.
*hugs* Its scary when they are so sick for the first time huh