Without knowing more than what you've said here, I think she's either engaging in meaningless flirting (maybe because it makes her feel good about her ability to get a guy to flirt back), or else she's just being nice (the way she'd be nice to anyone, including another woman, a child, whoever) and you've mistaken her friendliness for flirting.
OR, she could be a woman who is flirting and "means it" and is either no above using you, or else not above having a meaningless relationship. In fact, she could be a person who "plays games" and/or isn't above using you for her own purposes.
None of these scenarios, to me, point to there being anything you can ever do to "make/allow" such a woman to be "emotionally attracted to" you. I'd say either take things as they are, or else drop it (your wish to make more of the relationship) or drop her.
She's either attracted to you or not. End of story. She may have emotions but doesn't want you "in on them", or she may, in fact, be as "emotionless" as you think she is (in which case she's someone with "issues", and there's no point in your wanting to bring those "issues" into your own life). The world is full of women. I'd say to find one who doesn't create the impression to you that she's "emotionless". Best case: she just doesn't see you in the way you wish she did. Worst case: She's a can of worms and best left for someone else to deal with/worry about. :/