So here's what I decided to do:
Her horse is here til the last day of the month. She has paid my husband for the training already, and my husband made the agreement that he will ask for her to ride the mare before they leave together, so he can give her the pointers she needs to keep her mare going in the direction she needs to be going. I haven't said anything to her, nor set this in stone, but I've pretty much decided, and need y'all's opinions.
I plan to have her come up on 3/20 and 3/27 and I will teach her the proper cues then. I will only allot myself a couple hours to spend at the barn period, because I only have to ride 2 horses myself on Saturdays.
In a way it's a win-win, because I'm showing her the proper cues, and a way to manage her horse, but at the same time, it's not long enough to be considered an "instructor." You know? So if she takes my advice, great, and if not, at least I made the effort, right? I just want to steer away from her feeling like she can come to the barn any weekend she wants because it is my husband's workplace, not our own home, and I will not travel to her. (We are soon reducing to be a one-vehicle family to cut costs anyway, so I'll have an honest excuse.)
Does that sound fair enough? At the very least, she'll have 2 shots to get it right before my husband makes his judgement at the end of the month, and she'll be a little more confident with her mare when she rides for him. And I'll just state to her that I can't allow her to bring her horse to the facility past her paid training without a facility fee...perhaps?