Best answer!
I can add Team Level (Mine is LV 25, so it’s more 24% exp gain).
Lots of people have fortune cookies from past events, each one is more 30%exp, and stack up to 150% (max 5 at the same time)
If she was able to kill the whale/cow of the event ( I cant because my game crash everytime more than 30 people appear), its more exp boost.
Also, He/she could have used Cards as well and you dont noticed.
Welcome to the club, when you can’t do some events to gain exp boost and dont have much other options.
If its your main character, use a Token is very useful, as I saw you use.