Mate... save yourself a lot of trouble fretting over this. Crushbone Keep is a group zone i.e. it's 'designed' for a group of six people, maybe three higher level folk at a pinch.
Sure you and your partner can probably kill some heroic stuff when you put your mind to it but it's slow and tedious... personally I'd rather stick pins in my eyes than try to duo a dungeon of heroics.
Don't be discouraged though, at later levels your wizzy half should be able to root/nuke solo just about any heroic mob that doesn't ridiculously out level her.
My suggestion to you is focus on stuff 'designed' for solo play, stuff you can do without constant death an frustration. Head along to
Category:Solo Timelines - EQ2i and follow your nose; there is some great solo quests and content available that will get you levelling up and having fun without all the frustration. I find it good to balance this solo stuff with joining the occasional group to do dungeons like Crushbone Keep or Ruins of Varsoon.
Have fun mate!
- Roldy