User blog comment:B214/Volume 22 spoilers/@comment-83.30.104.144-20160721134728/@comment-9595671-20160721135824

I'm assuming that it's likely they're not permanent members, they're just in her group for the tournament like Irina is. The rules say "even those who had been used 2 Evil Pieces will be treated as 1 piece unless you are a God." So she didn't actually use any of her pieces, they're just acting as said pieces for the tournament.