Children's Chapter book. Girl moves in with a family member(s) and attends a new school in a new city.

[Olivia]

I am making this post for my friend. She read this book in elementary school (she believes she read it between 2014 and 2015) and she remembers that the main character's mom abandoned her and the dad died. Thank you in advance!

[Kris]

Olivia, what's the location (country, region, well-known city)?