YA Science Fiction debut novel published 2020, 2021, or 2022 about a girl whose little brother dies and so she makes an AI of him. Spoilers ahead.

[Chelsea]

and names it after him then she puts the consciousness into her own brain and he is in love with her then she ends up in jail and she puts the brother’s consciousness in an investigator on her case. They also tried to get revenge on this other girl by leaking pictures of her

[Angela]

Every Line of You by Naomi Gibson?

[Kris]

Here's the Google Books preview of Every Line of You by Naomi Gibson - Angela's suggestion:

https://books.google.com/books?id=I-s...

I added the genre and a spoiler alert to the header/ topic title.