Her name should be written as Lyydia Alaja. Lydia is a foreign/Swedish spelling of the name and Araya is a completely different surname of foreign origin.
The censorship is fine. If we lived in a better world (one that doesn't sexualize children), it wouldn't be needed, but unfortunately that's not the case.
Using a black box is somewhat jarring, though atleast it makes the intent clear.
Edit: Thinking back on this, I don't really think there's...
I think 公式 is reffering to a brand social media account (in this case). As in, Andou though she might have gotten a text notification from Segawa but it was just a promotional post by a brand on social media.
Also, thanks for the translation, hope you find motivation to keep going!