because she wants to
What’s so wrong with her wanting to look nice? This is just like saying that’s it’s wrong to not look nice all the time.
Indeed it is weird and sometime it’s too much. But she is a 24 years old woman who seems to know what she likes and what she does. The fact that everyone has the right to dress up like they like, it’s enough to me to respect her style. She has always express herself in every aspect, including (specially) fashion. I think that’s the way she is. An the end it doesn’t matter whether we, as fans, like it or not. It’s about herself and if she is comfortable. Besides, We know she is not a regular girl. She embraces being different… Remember her words…
Ps: sorry for my grammar, English is not my first language