[Man of Means]

An idea is that because you can't call down every time and you can't fold every time, you have to pick some spots to call down.

This is a good spot to call turn and river against a habitual checkraiser because you have outs and may actually be in the lead. A8 or 85 could very well be her "draw hand". And she may have chosen to slowplay a flopped two pair.
Since you beat every other two pair, call the river. If you had a ROCK SOLID 100% read then fold the turn, you don't have the odds for a 4-outer -- (9+2):1 isn't good enough.