Middle grade time travel diary book - just released!

[Lila]

Hi! I would love to get some honest reviews for The Diary of Janie Ray, just released on Audible!
I will be happy to gift free copies to anyone who might be interested. Please let me know if you are!
Description:
Eleven-year-old Janie Ray just got a new diary from her mom. At first she writes all about the private jokes she shares with her best friend, Sheila, and the grief she gets from her little brother, RJ, who always gets into her stuff and never gets in trouble. But then, one morning, she realizes that the mysterious inscription on the old medallion she found when she was seven is written in a secret language she made up with Sheila! Join Janie as she explores the hidden mysteries of the medallion.

[Adrian]

Would this be ok for a seven and a half year old? My son and I like to listen to books together and I am wondering if this would fit in his realm. Thanks.