You're living in her home and she's still taking care of you. So, you abide by her rules.

Maybe she's trying to make it a little uncomfortable for you because she thinks it's time you get out on your own and become an adult. (Like you said, when she was your age, she had a lot more responsibility than you do).

I'm not saying that she wants you to leave, but if she continues to take care of you like a child, why would you ever leave? So, maybe if she makes it a little uncomfortable for you, she hopes you will take the next step towards independence.

Is that possible?