two others possibilities, maybe
I also searched using “wish organizations” and “Michigan” and got those two (that I have heard about before) and the Sunshine Foundation (which sounds familiar, but I am not sure) and the “Granted Wish Foundation” that I have not ever heard about before. Starlight is a great foundation and does a lot to help hospitalized kids–with video games and websites for kids to talk together about their illness–as many of these are very rare and only a couple to a few cases a year in any state). I think Starlight and the Dream Factory are probably the best to start with and to check further into the other two as back-up, if needed. A kid can only get one wish from one “wish organization” and they do everything they can to make it a wish of a lifetime by making it really special and optomizing the experience for each child–for example, if a child cannot walk far, to find the best way for the experience to not be too tiring.