I came across this sentence:

彼女はとても教養のある人ですね

Why is の particle used here rather then が particle. I am probably missing the
needed grammar to understand this sentence. Any help will be appreciated
CC BY-SA 4.0
2019-06-05T09:00:24.457
68677
2019-06-05T09:00:24.457
31222
question
particle-の particle-が
の particle replacing が particle