how I can help her and convince her to stay.Please.
Never, ever import a wife or try to convince this one to stay. The more you say "stay", the more she will like that mind game.
This case should conclude with: You want go? Then, go. I will miss you.
And shut up.
If you succeed, get her pregnant and she stays, for the rest of your life you will hear that you ruined hers. Not because that would be true. She would use it as a weapon during each and every argument.
Remember two things: (1) women fight dirty, and (2) they always lie.