I'm not sure that I can adequately describe why I'm giving this four stars, but I'll try. 
I liked what it did with immigrant families and the way they're given a rotten deal in Canada - and it's shown in a deeply true way in Scarborough. Given that the author immigrated from Congo to Scarborough, I can obviously assume this is an accurate narrative. The way girls and women - particularly Black and WOC - are treated as if their bodies are commodities, things which they have no autonomy over. I liked the way it was told, in vignettes, little stories within the larger narrative, that capture the life of a woman in moments that are major, or may not seem major at first but eventually come to shape one's life in major ways.
I didn't love the pacing, though, and found that despite the short length of the book, the narrative lagged a bit. The main character felt fully formed, but I felt that the side characters fell pretty flat.