One of my cats in the UK, called Hansel presented like this with severe wheezing & very out of sorts - took him to the vet & he told me Hansel had asthma, due to the spring weather we were experiencing - gave him a steroid shot & he was right as rain in a couple of days. Hope Daisy has something simple like that & nothing serious - all the best to you & Daisy.

Snowhound