Stop reading books! Not all children do things at the same age as others did/do. But eventually they will. And sometimes this is not always a good thing!
I assure you, she will learn to take her clothes off. And if you're lucky she won't do it when you don't want her to. Like in the mall! Or at church! Or the play ground! My twin girls did all of these things. Because there were 2 of them I thought it would be nice to teach them to take off their own clothes before bath time, just to save a little time. And it was so cute to see them scurry from the bedroom to the bathroom with their little fannies giggling! Boy, was I sorry I ever taught them that! By age 2 1/2, they could get out of their clothes right before your eyes faster then you could blink! And while I was busy trying to stop one of them from stripping naked, the other was doing the same thing! Once they learned to take their clothes off, I had to watch them every minute. Every morning when I went to get them up I would find that sometime during the night they both undressed themselves. If we went somewhere, the minute we walked in the door when we came home, they would strip. Or if we went to grandmas house! It really got to be an issue. I was afraid to take them anywhere! There was no keeping clothes on them. I purposely tried to buy clothes that were hard to get on and off but they always found a way. I had 3 other children that were older then the twins and never had this problem with any of them. I sometimes wonder how I made it through raising them 2! They are 27 years old now and both have 2 children of their own. And all 4 of the grand kids love to be naked at inappropriate times. Now, I just laugh and shake my head!