Beholden implies a positive feeling of being obliged, not a legal or negative duty. After the support during hard times, she felt warmly beholden to her mentor.
Pro Tip 2/3
Gratitude Implied
Using 'beholden' suggests a sense of gratitude towards the person who helped. He was beholden to his neighbor for watering his plants while he was away.
Pro Tip 3/3
Not Financial Debt
'Beholden' is less about financial debt and more about moral or social obligations. Although she repaid the loan, she remained beholden to her friend for the generosity shown.