If you go to her character page it has their name in hiragana
IMHO it's obviously meant to be the western name "Emily", but I'm sure you'll see it romanized both ways. There is rarely any consistency, even from "official" materials, for things like this.
>>13962>akira calls her emily in katakana
How can you tell the difference between Emily and Emiri in kata?
It should be Emiri, since that's the more natural romanization of the kata in question. It's also what the manga scans are using.
If it was meant to be the western name, it wouldn't be written in kanji.
It’s Emiri. >>13965
It’s rooted in Emily, but it would still be Emiri. You wouldnt refer to Emiri Kato as Emily Kato just because her name is a variant if Emily. Emiri as a Japanese name has also been in use for about 100 years. https://en.m.wikipedia.org/wiki/Emily_(given_name)