I use a swiffer all the time and Ive NEVER had problems with my furbabies. My friend has a child and did some research on the swiffer, she told that it USED to be deemed harmful to pets and children if ingested (crawling babies, etc...) but the company has since changed their formula and its now nontoxic. I wouldn't say to drink the stuff, but Ive never had problems with my babies and my swiffer.
I do not know if this is 100% true or not, this is just what my friend told me from her research on it.
Look it up on their website ....
Im sorry your baby was so sick, I hope she is doing better now!