I still don't understand it. She made a comment on your sleeping habits, maybe she just finds it unusual for a teen to be up at 10 in the morning on a weekend. That doesn't make her stubborn.
It just seems to me that you don't like her in general, so you're looking for reasons to justify it. I have to say, from your 'adventures' with her I read, she doesn't seem like all that bad of a person. A bit odd, yes, but you seem to be more critical of her than she comes off as "stupid" or "stubborn". :s
Its not that she's a bad person, but she finds reasons to call out both my sister and I for odd reasons if our actions don't relate to the way she grew up. She has a hard time gripping society, that its the way that it is. She needs to learn Im not going to change because she doesn't like the way I am.
As for this specific situation, she made a comment I found to be a dumb one because as I said, Im never asleep until ten o clock in the morning like she was implying. Its like saying if I were to come in to work when I was supposed to be, and my boss says that Im here early when I come in every day on time. Her comment didn't make any sense, and she makes odd comments like these constantly and I haven't found a legitimate reason for her actions besides her wanting to criticize others.