you can't let prior relationships or even experiences get in your way of moving forward and potentially meeting new people/girls. i know it is hard to get out of the mind set where it is like..why would she like me when she could have a cis male? or thinking there is something wrong with you because you're trans (especially if your relationships ended because of this). the only thing you can do really is just ask her. start a convo with her, say hi, ask how her day is going then just go "so i was wondering, would it be too much if i asked for your number?" if she says no, then it's cool and you move on. if she says yes then hell yeah! you won't know until you take that chance. especially someone who makes you nervous like that, i feel it is important to take those risks even if it gets you rejected. all you need to know is it might not even be you, and even if it is then it is her loss and would you really want to be with someone who didn't appreciate you or accept you for you or w/e else? nah.