Mingardi is having a great season, but remember this is not her "first" great season. 2 seasons ago she was one of the best scores of the league, but then they decide to convert her to OH. And she wasted a half season in Modena and a full season in Bergamo as OH.
If she stayed as OPP this whole time, by now she would be the perfect backup for Egonu. She should certainly play VNL and show what she can do. But I think right know Sorokaite is the perfect backup since she can play OH too.