I mean this with all due respect, but give the girl what she wants. If you go to all grain and something goes wrong, it'll be your fault for ever and ever. So save the all grain for something just for you, and that way if it doesn't come out just right, nobody (but you) will hold it against you. If she wants extract, give her the extract batch. When you've mastered all grain, you can impress her all over again.
If you want justification... historic scotch ales (yes, they'd be considered ales ) have remarkably low attenuation. You'll come closer to matching real scotch ale with extract than all grain, since extract is less fermentable in general than all grain.
OK, I'm full of BS, but there's some truth in it!