I'm the QUEEN of spaciness, so don't even worry. :P

By the way, try to make sure she puts it on (at least somewhat) correctly. I saw so many girls that draped the yukata on like a blanket and just tied the obi around their waist. I also saw girls that wore their yukata dingy and wrinkly and it looked terrible. If you want a tutorial on how to wear it, clean it or press/dry it, I can try to video tape one for you. :)