No matter what was going on with her, this is a very childish thing to do. If she could just have asked to be released, Modena would even liked the idea once they dont need her anymore basically. For me sounds like she was just not accepting to be the 2nd/3rd setter.
But going from Germany to Turkey right away was not a good idea. A player needs to know when she`s ready to take a big step, look at Boskovic, after the 2014 WCH she got offers from all over, but she decided to stay in Serbia because she knew she was not ready yet to take a big step, and look what 1 year of wait made to her career.
I agree with your theory, but the example of Boskovic is not right.. Tijana was playing for Vizura during the 2014/2015 season, so the WCH was played during that season.. she had to play it till the end and then she went to Turkey.. it's not like she played the next season in Serbia too.. also comparing Germany to Turkey and Serbia to Turkey makes no sense.. Sure Serbia has talented players, but their league is not on the same level as in Germany.. My point is, her 2014/2015 season in Serbia is not the reason she is playing great in Turkey, but I do think it was a smart choice to stay in Vizura