The way I took her words in that clip was to mean that "this" (indoors) was the last of the three seasons (cross country, indoor, and outdoor) that she hadn't yet won an NCAA title ("gotten one"). I think she means she'll have a trifecta of titles across fall, winter, and spring if she can win a title at indoor NCAA nationals this year, not necessarily that she won't be competing in any more seasons after this year.
College distance running tears her body more than pro distance running. She should go pro as soon as possible.
As a college runner, she has to run two seasons straight with indoor and outdoor, then a short summer break, then back again to build up miles for the cross season, so much racing and running at the college level.
As a pro runner, she does not need to race much and she will have more recovery time.