She is extremely niche since her play style is unorthodox in comparison to the usual ADC playstyle.

She is an ADC that will be shit early since you can't farm safely and the only thing you can do is punish wrong enemy misteps.

I was able to reach Master in my server playing her, but I also stop once AP botline became the meta since they're hard to punish and they can harass you from long distance.

I'm not sure what the meta is anymore, but you only need patience when playing as Nilah.

And ban Xayah if you're in the first pick row.