Tank/healer combo for now and later?

[M.J.]

I'd suggest planning to have either 2 sets of characters you'll level together or a power level toon in your first set.

So Shaman / Druid for you and Warrior or Monk for her, to start. If she's never played before its very likely she'll go through what most first timers do after they first see someone else doing some fun thing their class will never be able to do, and immediately want to try out that other class that calls to them. So you'll be able to do some power leveling / exp quest item farming if that happens.

If you want to stick with Priest + Tank after leveling up your first toons, then I'd suggest adding in hybrid tank options + cleric for rezzes, and picking up one of the bajillion of enchanters running around to trio. Paladins will be able to rez eventually, and rangers will be able to do the hunter/forager cycle in kunark which isn't end game content but will make you some coin, and shadowknights would be a continuation of monk if she learns to pull - just with spells.

You guys could always go bard/bard and never die, but then you'd be losing out on utility for future characters.