Even beyond me personally, I thought it was such a great showing of progress in society at large. My sister made a point to her mom (my step mother) at one point about how it was different for her generation(well, technically we're both Millennial on the opposite end of the range, so same generation, but you know what I mean) because of the exposure in the world.
But on that personal level... She is friends with a few FTMs at her school (I still think it's strange there's a good dozen FTMs but no MTFs at her school she is aware of, since the stats usually go in the opposite direction), and has always been so genuine regarding the issue. More than anything, I appreciate the fact she is the type of person who looks at the individual no matter what. If there is an incident at school, she isn't the type to react with the common self righteousness you see in many erstwhile allies no matter what the trans person wants, but makes sure to pay attention to what they want as an individual, and doesn't just use it as an attempt to inflate her own ego like I worry many do. (Which often involves not creating a scene and calling further attention to themselves in that sort of setting.)
Essentially, she isn't just another person on a social justice crusade, but truly cares about the people involved. And to me that matters so much more, as it creates a foundation for the future out of true goodness rather than from the ever changing and unstable social atmosphere of the day.
Also, my step mother likes to setup secret Santa stockings, and I actually have my sister. She's going to be getting a crate of double stuffed Oreos.