Bless you for taking on this situation. Can you "foster" this mamma and her babies and find them good homes yourself? I did a search for Michigan no-kill shelters, and found this website that had some links. They may be able to help also. We adopted our kitty (Cammie) from a no-kill shelter. She has a forever home with us. Please let us know how this turns out.

p.s. A stray boy kept jumping in my sister's window. He obviously belonged to someone but they weren't feeding him or taking care of him. She put a collar on him with her phone number on it. NO ONE ever called her and asked shy she had put a collar on THEIR cat. So, we took him to the vet got him neutered and a through exam, and she belongs to him now. That mamma kitty knows a good thing when she sees it. I wonder if the lady would even notice if you had her spayed -- I doubt it!

http://www.saveourstrays.com/no-kill.htm

Michigan

2nd Chance Animal Adoption Agency
ADOPT-A-PET - Western Michigan
Adopt-A-Pet, Inc, Fenton
All Paws Animal Rescue, Ann Arbor
Animals Deserve Adequate Protection Today & Tomorrow
Animal Placement Bureau in Lansing, MI
Animal Welfare Society of Southeastern Michigan
Betsy's Haven Rescue
Cat Connection, Berkeley
Charly's Exotic and Small Animal Rescue
Companion Cat Adoption Agency, Grand Blanc
GreyHeart Greyhound Rescue/Adoption of Michigan
Help Orphaned Pets Everywhere, Ironwood
Humane Society of Saginaw County
Jethro's Place Animal Sanctuary, Memphis
Kalamazoo Animal Rescue, Kalamazoo
K-9 Stray Rescue League, Oxford
Mason County Humane Society,
Michigan Animal Adoption Network
Michigan Animal Rescue League, Inc., Pontiac
Mid Michigan Society for Animal Protection, Mason
P.A.W.S., Sault Ste Marie
Pets Alive, Inc.
Volunteers For Animals in Utica, Michigan
West Michigan SPCA, Muskegon