A nurse bought a new townhouse to live in while she worked for two years at hospital in a city 175 miles away from her own home. At the time that the nurse bought the new townhouse, housing prices were at the top of a cycle. The nurse took out a 15-year mortgage to buy the new townhouse, which the mortgagee promptly recorded, and hoped to get back what she paid for the townhouse in two years. Unfortunately, the housing market declined rapidly after her purchase. At the end of the two years, the nurse sold the new townhouse, but the selling price did not cover her outstanding mortgage debt. The purchaser paid her in cash. The purchaser did not assume the nurse's mortgage, but rather took subject to the mortgage. The nurse promised the purchaser that she would use the cash proceeds to continue making mortgage payments. However, after that date, the mortgagee received no further payments from any party. What recourse does the mortgagee have