She doesnt need to eat 3x/day tho. It might be a process for both of you to adjust but she's better off 2x/day and up the fun making. Also, what I have found helpful to reduce begging or harassing for food is to have a ringtone that only plays every 12 hrs so she learns yo associate feeding as being preceded by that tone rather than an ad hoc thing she can endless renogotiate you over chronically.

Does she have a cat tower/tree? Those are helpful to keep them active and jumping up and down and shit