I would love if they make her available via exchange shop in the near future...
I'm pretty sure they will not, unless the book wasnot sold anymore. If I'm right, the only girls in the exchange shop are girls from comiket and Anry from a crossover mission between FGK and Girls Symphony (game currently dead and that's why we have Anry in the shop). If a girl is available with any other way, she will not be in the shop. At least, if they don't change anything about that...
Sorry if I broke your dreams but... you should know.