She apparently retired to give "more chances" to young players. Although I don't know much about that subject.
That's partly the reason. She also couldn't stand all the criticism and mocking in Serbian media after her poor performances in Fed Cup final. Naturally, she thought she didn't deserve such a horrible treatment.
I think it will be Jovanovski. At first, my thought was Jovana, but considering that Vranes said that Bojana already trained in Bucharest for couple of days and that she feels great, I suppose he'll pick her. Perhaps if Serbia leads 3-0, than Jovana will get the chance to play.