Bands, or tiny scrunchies. I had trouble with the tiny scrunchies staying in at first. Now I use 4 wraps and they stay pretty well, but will pull out nice and clean when you grab all 4 loops at once, plus, to loosen, I just grab all the loops and g.e.n.t.l.y lift to loosen the scrunchie, then pull a few hairs out of the center of the topknot to 'set' the topknot in place...gives a nice little poof. Brody and Mia both get topknots. I also use 2 scrunchies together and 3 wraps to make a cute 'twisted' look and 'match' outfit colors. I use bows, but not everyday...the colored scrunchies are so cute by themselves. I make their bows, so I will put a bow on a scrunchie, too...really cute that way, too.
Good luck with whatever you decide...she'll look adorable no matter what you do!