alrightt guys ima long time forum reader 1st time writer, but to the point

Alright, well i know this girl through a friend which fucked her roomate. i met her last semester and i see her sporadically. there was a latin dance party and i saw her but she didnt say "hi" to me and pretended not to see me. you know how girls do pretend not to see you. but anyways, long story short, she knows we r friends on FB and say hi to each other on and off on campus sometimes i even see her in college bars, night clubs w/e. THis is where i need help amigos, i saw her last thursday at a night club called her over from a group of ppl and said ," hey come over i need to ask u something when but only when ur done" she said ok but she didnt comeover when she was, she walked by me again and saw me standing smoking a cig and didnt come over. finally i was on the roofttop couches sitting next to othe ppl in the club and my friend that fucked her roomate. she came up and asked if we saw her friends or asked my friend something i cant remeber but then i called her out on not coming over and talking to me. I think calling her out was a good step but anyways im talking to her and i was like "damn page wtf is up i aint gonna hurt ya i need you to tell me somethin"
her " ok"
then i asked her "look im tryning to prove a point tto my friend here, in one word describe ur ex-bf.." she said military and said another word until i got to the word "asshole" and she smiled and agreed. longstory short we talked bout her past bf, asked her how many dudes talked to her and completed negged her how she though she wanted some guy to call her back after talking bout boats n stuff. I said" wow that is really boring, jeez ur fun arent u" then i asked "do u play games? cus if so we arent facebook friends" she laughed and smiled. she started looking around because im pretty sure she lost her friends i decided to end and said, "well u gotta get ur friends what kinda friend r u losing ur friends" then i said bye and left

1)Guys please let me know how i could of improved what i did right
2) sometimes she appears online on facebook and stuff i wanna talk to her but i dont know how to start a convo. or where i should pick up from.I HAVE the confidence to talk or send messages BUT i need material and tips on how to escalate.

Thanks for your help!

She was ignoring you, so I didn't think it was a good idea to ask her to come over when she's 'ready'.
You could've just waited for her to walk by or shit and then started talking, because if you're asking her to come when she's ignoring you, it's like asking for another ignore, if you're not acting alpha. (high value in the club)(but i dunno if shes hot, i guess so)

The conversation material can only be thought up by you. It's your life and your situation. Ofcourse there are many people that have canned shit, so if anyone has got that kind of convo material I'd be glad to see where it takes me.

she was a 7, yea now that i think of it i felt like she was ignoring me, and your rightt i gotta acct more alpha thanks for the insight man!