I used Chiyo when I first got her. She was decent for like ten levels give or take. She's really not that great in the long run.

She's kind of nice in ranked for her revives but is definitely outclassed later on. Feel free to use her :) But be prepared to drop her.

I used her on Ranked battlefield because of her revive mystery but I replaced her when I got Jigukudo. Obviously Jigukudo is much better due to heal and debuff clearance, so to answer your query she's good early but not in a long run. ;P

she is ok if you can protect her puppets, but with more ninjas doing aoe now the puppets gets removed really fast until then she can be a decent support in GNW at the very early of the game prior to akatsuki etc.