Wow, that is odd she doesn't like little dogs but likes big ones. Maybe you could use positive reinforcement and give her a little treat or a toy she loves whenever she's around little dogs, then maybe she'll start associating little dogs with treats and see them as positive. I've never tried this but it is something Victoria uses on "It's Me or the Dog" on tv. She had a episode where 2 little chihuahuas kept picking on a bulldog she kept giving the chihuahuas treats whenever the bulldog came around and then after they associated treats with the bulldog they stopped picking on the bulldog.
How old is your dog? I started putting my dog's hair up in bows as soon as I could so they are used to it now. I put them on a small counter that doesn't really have much space for them to move around so they hold still, it's high for them so they don't jump off either. What kind of bows are you using? The bows with rubber bands or barrettes? I put my dogs hair in a rubber band first and then use a bow with a barrette (I can never get the bow on straight with the rubber band bows). I find the barretts are easier. Or you could buy a grooming table that has an arm with a noose like professional groomers. They're expensive but the arm & noose will keep them still a little better. I hope this helps!