1) never neuter yourself. this means, never kill your own chances...yourself!!! this is only possible when you don't try.
2) remove her #. i'm not sure if you should remove her from FB. i don't have a FB so I really don't know what is up with that sh1t in the first place. I'd just keep her and ignore her if she posts anything.
but I do have a phone and people I do not need to call are not on my phone. also this will help because if she calls it will be some random # and you will be like "who is this?" and that will show you have forgotten about her ass. Anyways, never act like a b1tch and ignore people in person. I'd be "pleasant" in person, which is different from nice. But phone convos, I end short because I'm busy. online convos I ignore or give 1 word answers or answer that dont make sense. Like if the girl says "ugh my life sucks." I go "i see." and I just repeat some variation of uh huh or i see or yea. and she will eventually say "so what do you think?" because women like to ask that. and I just repeat "yea that's nice." and she realizes damn he was ignoring my ass this whole time. anyways, i'm getting off track.
so since we ruled out that you're going to give up, you need to ask her out because that is what you want. i'd keep it short, and whatever you do, don't REACT to it like you care if you get rejected, even if you do, and you probably will, but don't show it. treat it like an errand you have in a long list of errands.
you: "hey wanna go out? I'm going <place> at <time>."
her: yes <blah blah blah>
you: alright its a date. i'll meet you/pick you up/etc.
OR
her: no <blah blah>
you: alright your loss, talk to you later.
then of course, you never actually do talk to her later because you delete her # 5 seconds after that call. unless she calls and wants ur d1ck. BOOM DONE. then you go to the next thing on your list of sh1t to do to kick ass at LIFE, which is probably 10x more important than this girl even if its taking a massive sh1t in your toilet.