Will really come down to who wants to play and who's good enough. Unless she finds a pro contract overseas in the meantime (reasonably likely imo), you'd have to assume Hahn is in both those categories.
she's only one year in to university in the US so won't get a pro contract for another couple of years - although I think she will once she's finished there
but given what she said about the difference between NZ and Germany in playing styles I'd expect her to be looking at Europe
One thing that's amazed me getting around the grounds over the last month is that so many players do seem to be planning on heading back come August.