Guilty?
Did trainer not make a commission on the sale of your horse?
You didn’t “use” anything that didn’t benefit her as well.
Even if no commission was paid, she was aware of the deal & went along with it.
If no expectations were expressed, none should be existing.
Many (30+)yrs ago a dear Trainer/Friend told me:.
"You enable the trainer
Meaning, as a client, the relationship’s boundaries should be set by both.
Not one or the other holding the upper hand.
It’s a business relationship, or should be.
I’ve seen way too many adults who get along fine in their working lives, Adulting without a problem until it comes to horses.
Then they seem to default to Mommy/Daddy Knows Best & hand over the reins(pun!) to their Pro.
I never fell completely into that trap & years later it’s served me well enough so in my dotage , I have 3 horses at home, of varying ages (23, 21 & 9), all in great health, took up a new discipline - Driving - at age 64 & show on my schedule or not at all, as the mood strikes.
Go forward as YOU intend, not as any Barn Culture dictates.
& end up happy
This hung at my desk at work to remind me why I worked: