>>44281424As long as she stays in the water she will be fine, the problem will be when she has to go to dry land to breed. Perhaps in this case she behaves more like a Sirenia, which spends practically all her life in the water.
Conclusion: The size of the breasts of a female primarina defines its habitat, the arctic females are famous for their LARGE fat reserves, while the primates of tropical coasts with small breasts seek the company of humans.