Of course I think she will be playing in the most important
matches (like champions league or top matches in the Turk league). And
I don't really think that level of Turkish league will be much lower
now than in Italy (of course if all rumours and transfer news are fully
confirmed).
You are totally wrong about Turkish League level. You cannot compare it to Serie A under these conditions. Only three teams can have qualications to challange Italian teams on top level. Galatasaray might also maybe near to this level if they will make some big transfers but the rest is like high school teams when it comes to compare them to Italians. The league has quality teams and big names but it's so unbalanced overall. For example, last season all series in Turkish play-offs ended without reaching extra games. 17 games played during the play-offs and only three games were five sets and one was four sets. The rest ended 3-0. Even the final series were not extended to extra game. Fenerbahce had no lost during regular season and play-offs. The team lost just 6 sets in 30 games. We can already say the final of the next season will be most likely between Fenerbahce and Eczaci unless a big surprise wont happen. Even at best the next season Vakifbank and Galatasaray can challange this couple but they are not enough to eliminate them in a play-off series. I doubt Fenerbahce and Eczaci will lose even one set against the other teams except Galatasraay and Vakifbank. These four teams have big budgets. The money they pay for only one player almost equals to other teams' total budgets even maybe more. And the money is not enough. For example, Galatasaray will have big budget but they have not much options because all the quality Turkish players were already taken by the big three and the money is not a problem for this triad. So we cannot say Turkish league is a big challenge.
As for Kasia. If we consider current squad of Fenerbahce and they are gonnal get a top-class MB or setter or both (because they need them much more than an OPP), Kasia will be most likely the first candidate to sit on the stands in most local games because Sokolova and Seda have capabilites to replace her. So yes you are right on one point, she will get many chances to rest.