The common misconception is that if you pay more you will get better quality. I do not charge that much - some might say too cheap
and I generally give my clients about 25-30 pictures to choose from after a one hour session. And so far, 98% of my pictures have been purchased. Although, I am not saying that they are portrait quality -
How many pictures did she give you? If she gave you 300 pics and you only kept 12 - then I would be bummed. BUT, if she gave you 20 and you kept 12, I would not be so sad.
Also, what was your expectation? Did it match what she sd was going to deliver?