The level of difficulty of a book in terms of person's English proficiency

[Sofiia-Khrystyna]

Hi everyone, I'm from Ukraine, so I'm a non-native speaker, but for me, there is no difficulty to read in English. However, my mom's colleague who is also a non-native speaker asked me to borrow one of my books, because she wants to practise her English. Honestly, I haven't read all books from my physical TBR yet, that's why it is kinda hard to choose the most suitable one.
I have these books:
1. Revenge Wears Prada by Lauren Weisberger
2. The Circle by Dave Eggers
3. A Street Cat Named Bob by James Bowen
4. About a Girl, The Single Girl's To-Do List, I Heart New York by Lindsey Kelk
5. Thursday Murder Club by Richard Osman
6. One of Us Is Lying by Karen M. McManus
7. Digital Fortress by Dan Brown
8. Beartown by Fredrik Backman
9. Ask Again, Yes by Mary Beth Keane
10. Beach Read by Emily Henry
11. I Say No by Wilkie Collins
12. Win by Harlan Coben
13. Little Women (part 1) by Louisa May Alcott
14. Red Queen by Victoria Aveyard
15. Rogue Lawyer by John Grishman
16. After You by Jojo Moyes
Hence, maybe someone who has already read some of them can recommend which book to start with. By the way, if you know some other great and not-so-difficult books in English please feel free to write them in the comments <3

[Yana]

hey
emily henry books are pretty easy and fun to read
but better than the movies is one of my faves and so easy to read so give it a shot
the twisted series is easy too