So Beth is a horse surgeon who deeply regrets that she never got to be a human surgeon.

In a show so much about timelnes, can't you see a possible sequence that would explain that?

1. She is a young girl, loves animals
2. Goes to veterinarian school
3. Graduates, gets a job, does horsies
4. Is not respected by her father, neighbors, husband
5. Regret forms

Is there something that invalided this timeline?