Yeah I had no idea what she was talking about when she said "trot in squares" for now! She said Sandie is evading (like you said), she's learned these tricks, she's not doing it to be malicious she's just smart when it comes to getting out of work
She said we know Sandie can bend to the inside, but she's ignoring my outside aids, and I'm relying too much on the reins...so I'm working on keeping my hands down, using more of my outside aids versus pulling on the inside rein as support, and trotting squares to get her using her hind end more.
And my trainer got on to show me...Sandie got into this beautiful collection, she looked like this gorgeous dressage pony it was amazing, and my trainer had NO weight in the reins, just super light contact...she just got her working her hind end and she naturally collected right up! Can't wait until I can do that with her