According to globo.com, Sheilla indeed accepted Vakifbank's offer and is definitely going to Turkey.
She will announce the transfer only after the end of the season.
PS: A Brazilian player coming from abroad will get the points she has in the ranking. It's allowed just 2 players ranked 7 per team. Anyway, 7 points players are trying to change this rule before the season starts. Garay is seven.
A foreigner will get 5 points in the first season and the same amount if she stays in the same club.
The rule is different for men and women teams.