Imagine if Yesilyurt remained the same but they added Dalia Wilson as MB
That's possible though I don't see a reason why Vakifbank would loan Derya & Tugba while paying lots of money to Meliha, unless they will play with Meliha & Gabi duo, which sounds really unrealistic.
On the other hand, if Meliha's contract goes on, Tugba can come back to the team and Derya can be loaned, since they also have Gözde Yilmaz as bench opposite/OH.