Tabby and Trixie knew each-other were trans : ) It is probably why they get on so well. Tabitha has also been transitioning for much longer, and has better self confidence, so she does not face many of Trixies problems! I disagree that it needs to be 'foreshadowed' that someone is trans, it isn't a plot twist. Some people are just trans, and in my stories especially I like to tell their stories, because unfortunately we don't get much representation in media. I think you'd also be surprised by how many people in a small town can be trans, especially a small town with a university : )
I'm glad you enjoyed the series though, thank you for your kind words on the story!