She used every girl but olivia

I've been noticing for a while that she likes to dress Olivia in the most unflattering outfits. Ill-fitting, tacky patterns, and mismatched textures. I've been watching the new boutique and seeing which girls are used in it and I think I've seen every girl except Olivia.

Olivia is the one most rarely seen on camera so I'm wondering, does she just not like her, is she maybe rebellious, or is it something else?

If anyone has pics of her actually being used as a model in the boutique let me know please.