Not that it’s a big problem, but isn’t there a lot of overlap with Mikako re: working a lot, optimistic nature, etc? Nothing wrong with having two cheerful gals but it would be interesting if she were on the more flirty side to better put her apart from mikako. Her forcefulness also relates her to junko. Obvs traits aren’t locked to one character but I do think the more the traits are different between characters the more drama / interesting interactions will be had.
Also, I can’t really tell if our characters knew her before her change, or if they only met her once she moved to the area after her parents deaths. 
Overall, I think there’s some potential here to be a flirty, ditzy kind of gal with hidden depths, but it’s up to you!