Not sure if you have done it but for what it's worth if you can grab a higher quality picture of her face and throw it in R18 the results can often be good.
I took one of your pictures and put it in and it seems to suggest: 春川せせら (はるかわせせら / Harukawa Sesera)
Similar hair style and color but again given the bluriness and you don't see her face head on in focus it's hard to be sure. Man I'm going to miss R18's image search badly. A huge loss.