Can a creditor legally revoke a debtor's nursing license for nonpayment?

This threat violates the Fair Debt Collections Practices Act (FDCPA)!  Call an attorney.  You can sue for damages and attorneys fees, not to mention the $1,000 statutory penalty that she can put in her pocket!

You need to speak with a local consumer rights attorney.  There are various federal, local, and state consumer protection statutes that may protect your daugther's rights and a local consumer rights attorney will be able to determine which laws apply.   Additionally, there may be some violations of consumer protection statutes designed to protect your interest.  A consumer rights attorney will be familiar with the law and can determine if there is any recourse for your daughter. Most consumer rights attorneys offer free initial consultations to determine what options are available. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.

First of all, the creditor cannot revoke anything.   These sound like empty threats which are illegal.  This form of intimidation is frequently used by debt collectors.   The law is clear on this.  Moreover, you can make them stop calling your daughter by sending a letter.  Lastly, your daughter can file suit and possibly recover damages.   www.ConsumerRightsOrlando.com If your daughter is interested in pursuing this matter, she can contact me at njtlaw@gmail.com.