That's the trouble O.C. you can pick your friends...but you can't pick your family.
I am not a royalist and not really knowing the ins and outs concerning the Queens reign, I imagine at the end of the day it's a person doing a job... same as any other person doing a job, but out in the real world when you reach retirement age your ready to hang up your spurs and put your feet up {I did my 50 years and that was MORE than enough}
The only reason I can come up with as to why she's still hanging on is she doesn't want to give the "job" to the likes of Charles or even Andrew, if I had to pick one out of the bunch it would be Anne. When she was younger she was 4th in line to the throne, unfortunately due to the rules that have probably been around since Magna Carta others have overtook her and they in turn have had sprogs so she's now 16th in line.
The Royal family need to be dragged kicking and screaming into the 19th Century let alone the 21st.