She wants to ruin the people, and have them around to wallow in how ruined they are.

This. It's why Daniel is such an integral part to her plans--he is what Victoria values most. Destroying him in some way is possibly her goal.

(ok, so I think murdering him might get the maximum amount of damage, just so she can see the fall-out, but you're right. I don't think she's quite at the level of murder yet)