Well, I am sorry to have to say this, but your mother needs to get a life!
As for being the baby, I was the older of the two of us. My brother is a year younger than I am. I was always my late father's little girl, up until the day he died almost 6 years ago. My brother was always Mama's Little Baby Boy. However, now that I am a widow, I am Mama's little girl and she worries about me. However, she does not get involved in my business unless I invite her to do so. Mama is my best friend now as well as my mother. I think that kind of relationship just comes with maturity, on both the part of the parent and of the child. ;)
I hope it does not offend you but I have to agree with GoodGirlInRed.
You're right about Moms/Daughters. My Mom is my best friend as well. She still gets on my nerves occasionally... but it's a minor annoyance. (she treats me like I'm 15 at times) I think she just worries about me too much. She's now 70.... is in Real Estate and runs circles around me! LOL