I'm not the category monitor. I just hate to see people shopping for cheese in a hardware store. "Family Tree Creatr" is a genealogy program you can buy, like "Family Tree Maker" or "Roots Magic". This forum is for peopel who have questions about the program.
Without a link to the family tree you saw, no one can help you. There are a dozen big places people put family trees, and a million little ones.
Chances are you'll have to contact whoever created the tree to add the fact your mother has passed on.
If you can find the link again and post it as a follow-up, I'll try to help you.