Is Genny still good?

She sill has the highest attack and very good resistance but her speed is lacking so Elise, especially with Cavalry buffs, is the best healer in my opinion. If you don't need to pass Wrathful Staff to another healer then use her but I would suggest refining Elise for dazzling and giving her Genny's Wrathful Staff skill, being able to attack and pin the enemy down with no risk is pretty handy.

hello, I think Genny is still a very good healer, she has a big attack and now the prodigal care after the healer's attack.

My Genny is atk + speed -

I don't use my genny in the arena, but she is a great chip damage unit for PvE maps like the infernal GHBs and BHB's. Definitely worth building her to cheese out some reward maps with gravity chip and dance/reposition to pull her out

Yes, she's still good. While Elise needs horse buffs to be useful, Genny is capable of working on other teams, so while her maximum potential isn't as high, she's more flexible, and requires less inheritance, too.
She can also be fairly speedy, as well, but requires more investment to do so. It's not her optimal build, but here's an idea.

Genny is quite amazing on her own. Mine, (built for speed and with the proper teammates) can double and kill anyone at or under 49 speed. (38 base, 41 with blessing, 45 with hone, 47 partner support, -7 on enemy due to Chill Speed.) However, since that requires much more investment (as in many merge copies), I would recommend either a Pain+++, or going Fear+ and becoming a mage tank.

If you have CC available, either running Pain+++/CC/Vantage or Absorb+/CC/QR3/CD3 are probably her most optimal sets unmerged.

If you really want to use her as fodder, I have a friend who has a +10 Lachesis that hits 58 attack on a wrazzle-dazzle build. She's more easily available and can be almost as incredible as the sheep lord herself.

EDIT: the pic has Speed +3 instead of Atk/Spd +2, which I run.