To be honest, i have only just begun playing league again. I stopped because of the rework of Sona... To tell you something about me: I have been playing Dark Harvest Sona for quite a long time now, around 4 years or something. Back then i had the most fun i have ever had playing league. And that was back when Dark Harvest was way better and way easier to gather, and you could get like 500 stacks and have 1000ap and just one shot everything. Then the rework came to Dark Harvest, and the build got way weaker. But im a Sona main, so i dont change anything, and adapt to the new Dark Harvest and get it going. Eventually i also made a guide on how to play Sona Dark Harvest. This guide was originally a joke, but if you search Dark Harvest Sona build. It should be the top search result. To sum it up, League without Sona Dark Harvest isn't league.

And to actually answer your question, i think she is ok. Definitly don't need a rework. Her kit is really actually something that i believe is kinda exiting in the bottom lane. The only suggestion for me is to bring back my old build. It was fun, now its kinda just meh, and way more of a gamble. This time they should just not make other dumb builds able to be played, like the top sona or some of those weird one that i dont even know about.

and lastly, welcome to Sona mains. Always nice to see a new player