I think you are referring to the version of the game for iOS (iPad, iPhone or iPod). This is the forum for the Windows/ Mac OS version. You'd be better off posting in
this forum.
That said, you would normally get a marriage proposal after she's been in the house five minutes or so. If that's rejected, you'd probably get the next one after about half an hour, and later ones at longer and longer intervals. I can't speak for VF2, but in VF1 the problem you report was down to the device's system clock having been changed.