Hello,
Im new so not sure when this was posted - sorry didnt see the date just the cry for help
I would suggest business cards - I made my own which I think looks better - shows you put time & effort into your business & most parents think ( or so I have been told) that if your putting this much time into your business cards ( care) shows how much does she would care about/for your children - and that would be ALOT!!

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Also flyers with maybe a little something like animal crackers/Sugar Free lollies - in a baggie or decorative baggie - if its going to be a daycare *expo* or such, then there's bound to be kids with them (?) that little touch could mean the difference
just a few ideas
hope this helps and finds you in enough time OR you can use for another time
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