After studying this lesson I took a C1 test. I was given:
Quand elle _____________ enfin au loto, elle sera heureuse. (gagner)
I wrote Quand elle aura gagne enfin au loto, elle sera heureuse. (sorry, cant get the accent over the last e in gagne).
This was marked incorrect with the correction : Quand elle gagnera enfin au loto, elle sera heureuse.
The pattern to use seemed to indicate "once she will have won finally at loto, then she will be happy. That is, first she will win, then she will be happy. What am I missing here?