You’ve probably heard it many times before, but here it goes:
You dont NEED to dps as a healer. No one is forcing you. Most people wont expect you to dps AS LONG AS you dont do medium/high level m+ or raiding, where killing stuff fast enough is important. For the content I assume you’ll be doing, there is no need nor expectations for healers to dps.
If you’re thinking about the actual design of the spec, then yes, disc priest isnt moving away from atonement anytime soon. You can tweak the talents a bit, and go oracle, to make it more “healing-friendly”. But at the end of the day its never gonna be the optimal way to play the spec, unless you mean pure single target healing and nothing else.
I know many people feel this way, and I dont know if its due to some philosophical conviction, or if it simply comes down to difficulty and stress factor. If it happens to be the latter, here are some useful macros in case your gf targets the traditional way (either by clicking on the frame or using keybinds). These will allow you to do dmg while having your teammates targeted, and will be casted on the target of your friendly target - can also be used just the same way your normal dmg spells works, on an enemy target:
Mind Blast
#showtooltip Mind Blast
/cast [harm,nochanneling:Penance] Mind Blast
/cast [@targettarget,nochanneling:penance] Mind Blast
Smite
#showtooltip Smite
/cast [nochanneling:Penance,harm] Smite
/cast [nochanneling:Penance,harm,@targettarget] Smite
Shadow word: Pain / Purge the wicked
#showtooltip Shadow Word: Pain
/cast [nochanneling:Penance,harm] Shadow Word: Pain
/cast [nochanneling:Penance,harm,@targettarget] Shadow Word: Pain
Penance [keep in mind you’ll need a separate bind to use it defensively]
#showtooltip Penance
/cast [nochanneling:Penance,harm] Penance
/cast [nochanneling:Penance,harm,@targettarget] Penance
So if she wants to do some dmg without having to swap targets to enemies all the time, this makes it a lot easier. You see the pattern, just change the spell name and add whichever spell you desire.