It formed part of the court papers ?
Heres the relevant section
‘The financial legacy of her college tuition fees was felt for years to come with lawyers for the Mail on Sunday claiming in court that Thomas Markle was still repaying the debt until at least 2014.
However, Meghan has been clear in the past that she believes the "challenges" were worth it.’
I’m guessing they provided a copy of a loan agreement with payments ?
she spoke about attending college and said
She said: "As a university graduate, I know the personal feeling of pride and excitement that comes with attending university. I am also fully aware of the challenges of being able to afford this level of schooling for many people around the world—myself included.
"It was through scholarships, financial aid programs, and work-study, where my earnings from a job on campus went directly towards my tuition, that I was able to attend university. And, without question, it was worth every effort."
her wording above would lead you to believe that she paid it all, but her father was probably not able to get a loan for it all.