Estate Law Questions? Ask an Estate Lawyer.
Even if you are the Executor of the Estate, you can only pay from the assets of the estate. If there are no assets, you are not personally liable for the debt.
Even if you went to Court for reading of the Will, if you were not appointed as the Executor of the Estate, as the Personal Representative, then you are not the Executor. If Sallie Mae does not agree, then Sallie Mae should file lawsuit against you so that you would get an opportunity to tell the Court your side of the case and let the Court decide. In any event, Sallie Mae CANNOT seize your assets without getting a Court Order.
At this time, it may be prudent to ignore all calls from Sallie Mae and let them file lawsuit against you. You can then file an answer to the lawsuit and tell the Court your side of the case.