You will regret this.
It will take you a few minutes to realize that you are looking at a pile of hair. Real hair. Not Barbie hair or My Little Pony hair. Arden's hair. You will begin to exclaim, "OH, Arden!" as you try to process what's just happened. The 2 1/2 year old will think she looks very beautiful and will tell you over and over, "I so pitty," as you frantically search her head for the origin of all that hair. You will find it directly on top of her head, about half an inch from her scalp.
You will eventually realize there is nothing you can do about the bald spot on her head so you will take a picture and put it on your blog. Then you will hide all the safety scissors in the house--and the glue, just in case she decides to get creative with all that hair.