That would work too. I think just being able to aa heal your team mates takes away from her being a hard, but amazing healer when played properly.

Overall I like it, I had very similar ideas for her heroics especially the armor one. However, I was thinking to keep ana feeling like a harder support to play, like she is in overwatch, that her auto attacks should heal but make her Q a skill shot heal that has a short cool down (maybe 1 or 2 seconds). IMO I think making her auto attacks heal takes away from how she is played and I would like to see her be a high skill cap healer that is very rewarding when played right.