Can my mother ask me the money my father spent on my education loan

My father spent his lifetime savings of 11 lakhs in 2011 to relieve me from my Engineering & mba education loan and since 2011 I am the only earning member in my family. My parents were always dependant on me since they never had any alternate income. I secured a Govt job in 2011 and I currently earn 68k a month. After my fathers death in 2016 my mother stayed with me or my sister but past 2 years she is staying with my sister and I sent her approx 90k in past 12 months. I have proof in bank statement. I have never taken any money from my mother neither did I receive any property or asset from my parents or grand parents. I am completely self made and a common citizen. But despite my monthly contribution (I sent her approx 90k in past 12 months) she is asking me to pay her the amount my father spent on my education (11 lakhs) in cash. Neither I have that kind of resource or asset. Is there is any legal help for me?