Are we allowed to crit the student? I know you've had her as a character for a while but I don't know whether or not her student writeup also needs crit.
If not, please ignore the following:
sweatdrop First of all, I'd like to say how amused I am that her food tastes and hobbies (sans tennis) were the same as mine when I was in high school. Even her birthday is only a week after mine.
That part's not crit, though. That just needed saying because I also identify myself as a quiet person and I feel that your virtues and flaws portray how a quiet person views him/herself, not as they truly are. For starters, neither of her flaws are worded as flaws.
Quiet as a flaw should not include its merit of being objective or a good listener; it should explain how it can ruin relationships (and believe me, it does).
Confident (as a word) is not a flaw. If you intend Kallista to be
over-confident, you should probably change the name of the flaw. Unfortunately, I don't really see either in your description of the flaw and the last sentence negates its quality as a flaw altogether. Also,
Kind and
Sweet look synonymous enough that they should probably be merged into a single virtue. I have some issues with how
Quiet is treated as a virtue, but maybe it works.
Now to rebuild: while there are several quiet personality types out there, Kallista sounds most like
Enneagram personality type 9*, which I highly suggest reading about to garner ideas of real flaws for your character.
Non-confrontational,
Slothful,
Over-idealizing and
Wanton spacing-out are stereotypical flaws of this personality type. Other virtues to consider could be
Observant,
Objective or
Forgiving.
*
Types 4 and 5 are the other withdrawn types, but a 4 sounds too self-absorbed and a 5 too prickly to fit how you've portrayed Kallista.