She hasn't seemed to have thought things through clearly. Have you explained that it's not possible to do what she wants, because of the reasons Terpe mentioned above even if you did decide you would marry her? I like you wouldn't like to be pressured to marry and would only want to by my own choice, like you say it doesn't feel right when you are not ready.
I don't agree with what London_Manila says. Sure it is true for some, but I know a lot that would love to live back there and my girlfriend is quite happy to stay there for the rest of her life if it came to it and would only come here to be with me. Again, not every Filipina has to or wants to leave just so they can provide for the family, yes a lot do, but not ALL. A lot of them that do leave would prefer to stay, but sometimes have to leave so they can earn more abroad to provide for their family. It's not easy living apart from your close family.