well...how should i say this mate...you def did screw up
but on the bright side, all relationships can be repaired especially when shes into you as much as you said she was. so best thing would be, if shes a girl you wana date seriously if shes just a girl you wana hook up with then you gotta do things differently, to get her to meet you again for a coffee per say since you still have her phone number (but do not beg to see her. that would just ruin the whole thing for you. try to play a little push and pull if you can if not then just be normal, thats probably the safest way to go). when you meet up you have your chance to figure out why you fought and to resolve it so that both of you are happy and kool in the end. and once shes over her issues about the argument youre pretty much back in position to play the field. of course, you probably wont be able to k-close her the same day but you can work on building up the confidence so that she would hang out with you again, ideally in a date setting.
just a side note:
first, i wouldnt add her on fb at least until we meet again and talk but the better way would be if she added you...
second, if a girl goes up to your place thats usually an IOI (unless if she comes over everyday/youre only a friend in her eyes and vice versa, etc). if she hangs out with you in your room alone (IOI), on your bed (IOI), at night untill 8am (IOI) that really means that she thinks youre more than just a friend... and when she kisses you the light bulb shouldve lit up in your head and realize that hey, she wants me. she wants to fool around...
so im just sayin that you gotta watch out for the IOIs all the time coz you never know and if you play the cards right you might have even ended up with a lay that night and a gf by now, right? so just take risks... worst case scenario is that she gets up and goes home... youve got nothing to lose mate
as for the poke on fb... in my opinion you should never get too excited about anything when its presented in an electronic form (txt msg, fb chat, fb poke, msn smiles, etc) because people use them without putting any emotions, thoughts, real feelings behind them and if you get your hopes up about a poke and it turns out that she never wants to see your face again, she was just being nice poking you back..............you`ll feel like crap
anyways, chin up and set up that meeting. good luck mate.
cheers