You're still her baby, so of course she's worried about you. My Granny was talking about "the girl being at a difficult age" when she was 85, and my darling Mama (the girl in question) was 50-odd.
That's hysterical---and oh sooo true (I am 38 and she worries about me the same way she did when I was 13). It used to drive me nuts, but I got over it and I now that I have a little girl of my own, I can already see the pattern repeating!!