You could say 'I really want you to stay, but I'm not going to force you into anything. It's your choice.'

That shows her that you want her to stay, but also shows that you are being nice to her and not forcing her. It works in both ways.
And I'm going to be brutally honest here, but if she decided to move 400 miles away from you and doesn't want a long distance thing then she was never that much of a keeper to begin with. There's plenty more fish in the sea, and if she decided against long distance/staying with her grandparents then she's not a perfect catch!

moses if you want her to stay.. say out right that you NEED her.. that you Want her to stay, that you LOVE her (if you do that is) and if you really want her to stay try begging. Its her choice yes and maybe you don't want to influence it and want to see what choice she makes but she'll never know how much you want her to stay if you don't beg, and that might not influence her choice but it will affect her heart it good ways, it will show her that you care about her so much wether she stays or goes, and that could have a healthy impact on the way she goes about love in future relationships or with the future with you.

I don't think it is fair to judge the poor chick on her choice.

She might really miss her parents, whether they are good or not.

Yes but it is fair to judge her on if she wants a long distance relationship or not. If she doesn't then like I said, she wasn't the perfect catch.

And don't listen to EIMP moses. Dude, don't you dare ****ing beg.

whats wrong with begging, i mean you can do that but not take it to far, just for a moment to show how much you care.. girsl like that to a point, but yes its very easy to take it to far.. but it depends on you personality, chances are if you beg and you've never begged before it will come off as either your really trying to show her in every way possible that you want her to stay, or your not being yourself, so yes maybe its not good advice, but it could be depending on who you are, what type of personality.

Yeah...EIMP gave shity advice...you just need to let it be known that youd like her to stay

If you beg then I'll try and find some way to kill you. If you beg you are going against everything that manhood stands for. Show emotion, don't be a rock for **** sake, but don't ****ing beg. EIMP stay out of this now. Obviously the guys you have dated need their arses to wiped for them by Mommy.

I'm with LesPaul. NEVER beg. If she's gonna go with her grandparents and considers that more important, let her. It's better on both of you that you don't become dependant upon each other. I don't care if "girls like that", girls aren't worth that.

Please forgive me for asking this Moses, but are you a jealous person at all, like, even a little?

If so, a long-distance relationship will most likely drive you mad, no matter how much you trust your woman :(

You're with LesPaul? I'm the one who said don't beg! Don't steal my advice, boy!