If she is tall, from what I have heard from my friends, she will have an advantage in rowing for sure! Pretty sure rowing is mostly leg strength as opposed to shoulders?? Her cardio endurance from swimming will also be an advantage.
Anyway, I have a colligate swimmer who wishes he would have done crew in HS like many of his friends did … seems to be more of a camaraderie sport than swimming and many many scholarships available to women in crew!