Willow didn't dig buffy's body up because then she'd have to accept buffy was dead in the first place. if she saw buffy's skeleton she would finally move on from the denial she'd been stuck in. And if buffy was truly dead, she'd have to accept that what she was about to do went against the rules. Willow knew necromancy was wrong, but her fun cheat code was that it doesn't count as necromancy if you don't accept the person is dead.

btvs season 1 willow is in love with xander xander is in love with buffy it only makes sense for buffy to be in love with willow

I think dark willow should've kissed Buffy to mess with her. I think she would've if they weren't cowards.