if comparing 128GB, the different is rm 800.

i guess if buying with cash, iphone 12.
if go with telco or installment, better take the pro.

iphone 7 should still be ok for another 2 to 3 more years for your mom basis usage.

if you can get a iphone X at cheaper price will be even better. the redesign will make the phone looks not so outdated for the next few years. and it can be used longer. i managed to get one refurbished iphone x 256gb at rm1850 for my dad which is quite ok deal.