Re: Not sure if i should meet her
As you correctly pointed out, she seems clearly interested in you. So that's great.
You have two choices:
1) Accept her invitation, but tell her you will drop by for a drink, and then you have to go to this girl's birthday party, so you can't stay for long. Go to the club, see how it goes.... if you feel like it's too much for you, eject and use the excuse. If not, and she is all over you, game on. (The thing is, this is definitely a test. She wants to see how you do.)
2) Tell her you have another party to go to that night - dinner birthday party for a girl friend, etc. Then set up a time to meet 1-on-1 ... coffee, drinks, etc. and then do your thing. It's high probability she will say yes to the 1-on-1 meet up, if your assessment is correct about her interest level.
The world is your matrix. You control the strings.