Sorry Guys I neet to Vent my Girlfriend Problems

You just have to be polite and respectiful to her parents.What ever you do... do not have it out with them or blow up on them.Sounds like the parents like you enough to let you hang out with her and that's in your favor.And after 3 months together is not long enough to know if you really love her is bullshit.I fell in love with my wife after 2 months together and we have been together 18 years now.
If the Father is alittle more easier to deal with chip away at him more.Just be careful not to piss off Mom whatever you do.Just remember that is their little girl no matter how old she is.Just hang in there and hopefully her parents will come around.