What does this part mean exactly? She didn't want to be team captain or one of the main scorers of the team?
She meant she would be one of the team 'leaders' now that she would be the MB with the most experience. And what comes with that is that you usually take younger players (MB's) kind of by the hand and try to help them improve. That's not a role she sees herself in, also because there are many things she can improve herself (that's what she said).
I think is more like she will get less playing time than before. Probably they want to develop Timmerman & Baijens for starter
I don't think necessarily less playing time, because Selinger told her when she called him that he still saw a big role for her in the team. Personally I agree with that because seeing your best 2 MB's leave right before WCh summer isn't great. But it's also respectable to be this honest and make the decision to quit.