Glad the mature conversation worked for ya
It's just the way you said it, it came off as though you thought she owed you something for tidying up the barn. She didn't because her offer of free lessons still stood, just your horse isn't well so you weren't taking advantage of them.
When you talked to her, everything changed. You came to a new deal and that is now the arrangement instead of lessons.
Are you understanding that now?
I'm glad it got sorted!