No ,don't give up,but donT wait either. Meet more people and she may just call/If not .you haven't lost . Try not to pester,thats a turn off.
"Patience Is" Since she came back with a "I thought you lost my number" I don't think you concern is valid. Just keep trying.
Wait a while before you call her again. You don't want to seem like a stalker
Call her a ton it will annoy her till she anwsers and talks to u
give it a break and try it a few weeks later. if she has a new job and a new home, she might be really busy and glad if she's just for herself after work.
No, don't give up...leave a long text message explaining like hey it was nice to see you a couple of weeks ago, is your new job going as well as you expected, how are your coworkers lol are they as awesome as me, etc.
Honestly, I would find her and add her on Facebook or something if you haven't already. Then you can casually chat her or something, without the persistence that seems to accompany actual phone calls. But I wouldn't keep calling her; you don't want to come across as needy.
maybe shes busy, she did just move