I'm going to force my mom to sell the property she planned to retire in
Why would you force her to sell it?
I want that property for myself
That is a mean thing for you to do to your own mother. It's rude to dictate how your parents should live their lives. Maybe you can ask her to leave you the property, but you should force her to sell it.
I mean if it's going to be mine someday, so why not get it early?
I believe you should just leave your mom to her own life, she is an adult and you shouldn't tell her what to do. Why not ask her to come live with her or visit occasionally instead?