What's the Name of That Book??? discussion

I read this book around 2015/2018 for a "Battle of the Books" event my school district was doing at the time.

The cover had some kind of warmish light pink on it and a creamy white or something. I want to say the cover is a birds eye view of a city or street with little people or cars and in the middle is the title.

It follows a young girl who was in middle/high school. I remember throughout the book it talks about how she's doing some kind of school project talking about yawning and why yawning is "contagious".

She lives in a kind of "poor" ish apartment complex in a city with her mother (and maybe little brother/pet?). I remember it talking about how she was a "latchkey kid"

Her mom was studying to go on a trivia game show of some kind (I want to say it may have been jeopardy). The mom had a boyfriend that was some kind of sailor or fisherman or something and taught the girl how to do knots which she did as a like an anxiety/stress relief.

I remember there was some kind of boy second main character (I don't they ever had anything romantic just a classmate situation) I think she perceived him as kind of a jerk/bully character? I remember there was something that had to do with some kind of old man mysterious character.

There were some kind of clues or something they were following and a weird mystery kind of thing. Maybe some kind of time travel I remember the end was really weird/unexpected.

I remember for one of the questions in the Battle of the Books event it asked about the significance of quotes throughout the book from Albert Einstein or something (though that may have been asking about a different book)

I hope I can find this book, I've been looking for it for AGES :)

This sounds like When You Reach Me by Rebecca Stead.

I second When You Reach Me! Details match perfectly.
cover:

Yes this is exactly it thank you guys so much!!!

You're welcome!