Unit liberating La Chapelle Gauthier in WWII?

My Mom lived in a town called La Chapelle Gauthier in the Seine et Marne region of France during WWII. Around August 25 (her birthday) she was liberated by American troops. I'd like to know if anyone knows what units may have got through there. She has some memory of the day, but she never left the house. I'd like to learn any stories anyone has of that day in the town.