SOLVED. Girl who really good with numbers fake kidnapping to solve crime with FBI Teen (YA) About contemporary romance and action

[Jay]

It about this girl who 17 about to graduate high school. She's super smart she can solve unbelievably hard math problems and code and puzzles. She gets involved in a type o terrorist attack informs something she saw on TV and alerts the FBI of some type of US government workforce. She discovers secret messages on TV that she decoded. The Agent she meet is only a few years older than her. She gets in danger then has to hide wit him in a secret room underground. She falls in love with him but hes not having that, because she not 18 yet and unprofessional. It has a sequel. He's from a rich family with high expectations.
She has a brother who younger than her.
The book had a light blue cover with a picture of something on the front. The tittle looked lengthy about 7 words or so. Her dad was also super into stuff like her. She was able to sneak out into a small balcony where she was hiding. The room was small like one room plus small bathroom with a TV. No bed only like an air mattress.
It was an physical book and an ebook. I read the physical one. I read it around 2015-2016 and it looked sorta new like it'd been out for a couple years. It was not a thick book maybe 220-300 pages. The setting seemed late 2000s.
*****SPOILER ALERT******






They get to a relationship a few days before he birthday, and solve the case which i think was an inside job. They leave he brings her to his hotel room before they go back. She meets his parents.
He leaves for a jobs in Chicago or Boston for a job. His dad or guy he looks up to give him a letter that changes his mind and her goes back t her after her graduation.
before that the girl was really depress and not acting like herself and it was her birthday when she graduated.

[Jay]

I found it! It'sA Girl Named Digit