I see you are from MN...well licensing allows for 12 kids at once, but only 2 can be under 24 mos...unless she has a variance in place, but they are not as likely to grant those for infant and toddler spots, especially when overall enrollment is that high...so first of all, I would be checking on that.....ask to see her license (mine makes me post it in my entryway...many licensors want it in the daycare area, but it should be visible...you shouldn't really have to ask to see it I think, it should be there anyways).....but it does sound like you are feeling and seeing red flags...I always tell parents to go with their gut...it means something!
Kids do get sick more in home care situations...and as a provider, I know I am the bad guy alot of times in making parents follow the 24 hour rule with illness, etc...but I do it for myself and my 12 yr old daughter too...lots of handwashing and disinfecting..we go thru alot of bleach around here! But prevention IS the key....we have had a much better year around here than some in the past!
I would have a conversation with your provider...can't hurt to discuss some things in a non-confrontational way...but remember, she may be doing all the right things and kids are still gonna get sick...they pick it up at the grocery store and McDonalds (OMG those ball crawls and junk are the worst things on the planet for spreading germs...how often do you think all those surfaces are cleaned...ish!)and everywhere else they go...please don't blame it all on daycare. I follow all the rules, go above and beyond and clean (my hands look hideous from cleaning)..and kids still get sick.....just maybe not quite as much I hope....my little corner of the world...I do what I can......
Consider too if its a runny nose, itchy thorat, cough sneezy thing...could be allergy to something at dc home? pet dander from there or on another child coming in there??? certain plants or dust or who knows what they are coming into contact with there that they are not at home?????
Good luck!