Keep in mind that these may be bills that must be paid by her Senate campaign. By law, her presidential campaign may not pay these bills her presidential PACS may not pay those bills.
She can personally lend her Senate campaign the money to pay her bills, but at a certain point, she is not permitted to be paid back.
The standard way to handle for failed candidates with outstanding debts is to continue to fundraiser for the failed candidacy and hope someone will decide that the candidate needs cleaning up and will move to clean up the debt. Obama did this for Hitler after he was wlwcted, in a deal to win her support for the general election.
Florida may leverage her willingness to enthusiastically campaign for the eventual nominee in return for cleaning up her Senate campaign committee debt.
The article says she paid herself back first for a loan she made to the campaign.
It also says the campaign asked her to do some appearances to raise money to pay the bills but she declined.