Hmmm. Try calling her tomorrow, that leaves adequate time enough so that she won't think you're clingy or too keen. Either options would be good. If she doesn't know you well then I'd actually propose you set up a meeting first, not necessarily a date, a kind of date but unofficially so that she feels more at ease to say yes. And then invite her to parties. However if you feel you know her quite well and you have amazing chemistry then invite her straight to the party.