I used to love Jill books even though she annoyed me slightly. Seem to remember she didn't like her 2nd horse (Rocky or something?) when she first got him. The 8 year old me was annoyed how she could have an attitude when people like me had 0 ponies!
The one thing that sticks out in my mind is how much fawn coloured jodhpurs were mentioned...again annoyed me as I only had black