My mother keeps giving me times to call her and then doesn't answer the phone.

Just keep trying at random times maybe.

Call her at that time from a phone number she doesn't know and see what happens.

tell her to call you?

Dont call.. and dont answer her calls..😷

Ghost her for a couple years.

Go round there.

Check her phone, the volume might be muted.

maybe she wants you to visit her lol

Stop calling. She'll call you after a while.

I would just start prank calling her

Teach her some civil cellphone manners