Considering she's the daughter of an Aub, and how her brother doesn't want to become the next Aub, I think it's quite likely she'll become the successor, unless she's beaten by one of the adopted children of course. If that were to happen, she's near enough guaranteed to become the first wife of some other duchy's future or current Aub. With her being from a greater and top ranking duchy, the chances of anything less are minimal.