This might not help, but I had the same experience with a kitten I was raising, except she ran full-speed into the refridgerator door!
She was acting just like you described Daisy acting, except she couldn't even walk, she was acting dizzy. The next day she was acting normal again, but I took her to the vet anyway. The vet said everything was normal, and not to be concerned, she probably just hit her head really hard and got dizzy. My Belle was tiny, not even weaned yet, so I'm sure she was even tinier than Daisy.
I'll give you the same advice the vet gave me: don't worry, unless she's still acting strange by tomorrow,or if her strange symtoms get worse...
Good luck, don't worry too much. (Even though I know you're a good mommy, and thats your job!)