Ok, a
virgo - a woman whose love is stimulated through the use of mental
energy. Mercury her ruling planet, tend to make much more rational
usage than emotional ones. She is the kind woman where there are
conflicts between the mind and heart because they show different
directions. Her inability to answer your question is because of her
inability to make a decision to follow which side of her
soul.
To explain the whole chunk of astro-like rubbish above: She
demonstrate an unique quality that I would like to bring explain in
details. You mentioned that she had undergo a bad relationship
crisis which direct reduce her faith and morale in love. She is
unable to release herself from her rigid form of experience, yet
when you appear, she is not willing to let you vanish because you
seemed like an opportunity into the future.
Future will seemed dark until you venture and seek the source of
light. She is unable to leave the shores, yet she hates her present
situations. (If she has Saturn affliction Moon - she will feel that
love is a form of suffering. Worst if it's in sign of Pisces.
Mental and emotional state will constant receive this message: To
love is to suffer)
I can't remember what possible solution I had posted the previous
time - I can only say this: if one method don't work, try something
else. It seemed to me that you have always been employing
pressuring-making-her-LL way of communication when it comes to her.
You had already knew what's her problem - keep 'testing' or even
asking question that you know she cannot answer will bring you
nowhere. In fact, she will sink deeper into her emotional
haven and you will never get the answer/result you desire.

Do this: Do what she wants minus those questioning. If
she wants to be friends, then remain as one. Mentally, always
presume that you both are friends irregardless of what may happen
in the future UNLESS she confess to you about her liking and
probably you may like to post it here or PM me. How she wants to
define your relationship with you, how she sees love, etc - don't
matter here. By being with her like a normal/good friend - you will
gradually shape, influence and change her thinking.
You don't even have to directly mentioned anything.
Tension will brew if her liking for you is there.
Of course, during these period, you are free to date other ladies
as well. No promise, no liability, no relationship, no nothing.
BTW: You don't have to tell her that. 
Cheers