She is a great character. I enjoyed the Track Trio as well. IIRC both Ayako and the Track Trio have crushes on Shirou?
The Track Trio is more like they owed Shirou for a lot. He's the main person who fixes their stuff, but at least 2 of the 3 I'm sure doesn't really have feeling for him.
But yeah, I'm pretty certain that Ayako do have feelings for him.