Is this just super weak or sane play?

[DiceyPlay]

First time I've played 6/12 in months. My normal game is 4/8. I'm utg+1 and have KcQc in what I would call a not too loose and not too passive game. I've recently shown down a couple of strong hands and haven't had to show any of my losers. I raise. It's folded to the Big Blind. BB is an older lady that seems pretty solid. She calls and comments "I guess you've got aces again". The flop comes AK5 rainbow and she bets out. I fold [img]/images/graemlins/confused.gif[/img]

My thinking: I didn't think she'd call my raise btf without an ace in her hand. That board should have been pretty scary after I raise in early position - but she wasn't scared, she just bet right into me.

Was I weak or did I show good discretion?