Valeria is a beautiful girl no question but i can see why she wasn't used more cause she was like a mixture of daniela pestova and claudia schiffer and looking similar to another model is a big no no cause you need to be distinctive have a strong unique identity in order to be a big supermodel.
you could say her beauty was a little safe lacking in personality compared to claudia's bardotesque face. i prefer claudia and can see why she was chosen over valeria. at that time there were already 3 classy blondes claudia, karen and eva that designers & vogue italia embraced. valeria and daniela struggled there was so much competition. it really was tough to make it and sustain it especially with new distinctive faces emerging every season