Better translation: She has a lot of experience.
The closest I came up with: "Her experience is vast."
"She has so much experience"
experience is uncountable
"Dia" is a gender- neutral, so both "he" and "she" should be avalable as an option
Surely in english we would say .... He/She has a lot of experience ??? & a year has no passed from the other comments in case any body does site auditing....