I don't know if that is the case. I mean, statistically, she could be (10% of the population is gay or bi, there are about 10 girls in the game, do the math). However, I think it is more about her suddenly realizing she has no control over her adult life, and she is a slave to what her family "deems" required. Sarah said she was homeschooled and only went to the public school and got a job to get more acclimated to other people, and see how they live (probably her dad's idea). She was raised to believe that she will become queen of the empire, and now how she has to get that done, is by fighting an uphill battle, one which she is not equipped to handle (due to poor socialization skills).
The funny thing I am seeing is the lack of sons mentioned. I mean Brian is the only son mentioned so far. 4 families, only 1 son (Brian). Then the Fletcher lost heir = MC. So now you have 3 families foisting daughters at the MC so they get their place at the big table. You would think the Sarah's dad, with 4 wives, would keep having kids until a son was produced. Kind of like Henry VIII. Same for Catherine's parents? Hannah's parents? What would be really funny, is if first daughter, married first daughter. Hmmm