There is no defination of art, Its all in the eye of the artist. Honestly art should express feelings and impress people. So your arguement is wrong, art is varied on what you can and cannot do. If its a line and it could be counted as art. This art she has made is her opinion on how she wants to make it. It could look like total crap to others (it doesnt) but looks really good to her. Art is based on the maker of creation.