Your friend must have gone without Part B for a LONG TIME.
" Your monthly Part B premium will go up 10% for each full 12-month period that you could have had Medicare Part B but did not take it."
About 22 years as I recall.
There was also (I think) a flat one time penalty included. Can’t swear to it, though.
She passed away last year. Very nice lady, I miss her. We were friends for about 40 years, since we became neighbors in the late 70s back in Florida.