Aw!!! That's so sweet of you! It was really a blessing for my friends to throw me a shower this time around (my 5th baby), so I'm pretty sure she will be thrilled with whatever you do!
You could bake cupcakes and hide a little plastic baby under the icing (push it into the cupcake before icing it) and whoever gets that cupcake wins a little prize. The kids might like to play a silly game of "pin the pacifier on the baby" or something like that. Food could be mini sized... Always fun!
It's really the little sweet gestures.... I am sure she will feel very loved!
Mama to 5 littles and 1 on the way (Jan 2014) married to my Cajun honey and building a tiny house of our very own out in the Texas country.