Sam, your mom needs to mind her own business. I have 3 adult kids and would never tell them what to do. I am really amazed at the number of people on this forum who get told what to do by their parents. I enjoy talking with my kids and how they live their lives is up to them.
Gotta keep in mind that my mom was raised in India so her trying to run her life is precisely what would constitute "her own business." In the culture she was brought up in I would be not be truly considered to be independent in the eyes of my parents/family until I am married. My parents are far better about this having lived in America for a few decades but attitudes remain.
I should add that my mom isn't the one bugging me to get an arranged marriage. She's told me the option is out there and when other family members bring up my lack of marriage she shrugs and says, "It is his life," and "If he wants to get an arranged marriage I'm happy to find him a wife but that's not what he wants."
For my aunts that bring up marriage and arranged marriage, to them that's like talking about the weather. For instance at a party they'll welcome me by literally saying, "Hey Sam, are you getting married soon?" And then will start asking if I have a girlfriend. If I do, they'll want details and pictures of her. If I don't, then they'll start asking about arranged married. As I just broke up with my girlfriend a few weeks ago I'm glad to not suffer through dinner with family this past week.
As to the point about getting them to mind their own business, easier said than done. My parents, siblings, and a few close family members are the ones I hang out with. I avoid going to most family parties as it ends up being more of this. That said, I do care about my family and want to stay in touch with all of them and so I do go to occasionally gatherings, especially weddings and celebrations.