Why couldn't they fix her
I came up with the idea a while back that Vina might have been a physical composite. They pulled her out of the wreckage a "lump of flesh," and they had never seen a Human Being before. There were other people's bodies in the wreakage, what Vina was missing in terms of organs and bone and skin, the Talosian took from where they could.
The Taloisans internal anatomy might have been considerably different than a Humans, they couldn't tell for example a man's vertebra from a woman's, or in what order they were arranged.