25k doesn't get much:
50% Discount on Preferred SeatsYou and your companions travelling on the same reservation can enjoy a 50% discount on Preferred Seats, which offer extra legroom, on flights operated by Air Canada, Air Canada Express and Air Canada Rouge, with the purchase of an eligible fare.
with Flex fares on all markets
So she would have to have purchased a relatively high fare to begin with... to get 50% off.
Edit: you said "standard". So, no dice.