You've mentioned that about 2 months ago you started going out with her. In the last 2-3 weeks she's pushing you away? It would be important to know the reason you believe that she pushing you away.
Do you think she is no longer interested, her father may had said something to her, or she is trying to take things slower? Is she a virgin or has she been hurt by a boyfriend?
Women would like to be chased/to feel desirable (yet not brought to the bed right away)
At this time you may want to focus on making her feel special and safe.
Think of ways to show her that you are serious (do not appear overly eager or desperate or too available) Try to engage in things that both of you like and do things that both of you have in common. Not at the pub necessarily.