FASFA as in your education money?
I know this will probably come off as mean to you, but if you're out of a job and using state/gov allotted money for schooling as horse board money, maybe its time to reconsider your options. And by options I do mean possibly leasing out or selling your mare. Please, please, please don't think I'm telling you that you aren't caring for your horse. Obviously you do and are, or you wouldn't be wanting to move her- but if all you can afford is stables like this one (and this is provided that you can't move her to the other lady's place) it may be in your and your mare's best interest. Sometimes life gives us curve balls and we have to do hard things.
I'm not speaking on something I have no experience with. Remember Kenzie? I sold her because of the exact situation you are in. I could not afford decent board ($250+ for even self care in my area) even with a job, and when I lost my job I had to make the decision of keeping her and taking away from MY education fund (not fasfa, but same idea...it was money I'd saved up though) or selling both her and my other mini, and making sure they went to a good place. I chose the latter, and I HATED it. But I don't regret it, even if I miss them like crazy- because I know they're in great places and I no longer have to pinch non existent pennies.
If you are absolutely 100% against selling/leasing your mare though, the other options I can think of are 1. Asking around at barns with board a bit over what you're paying now (think $200 or so) and asking if you can work some of it off mucking stalls, turning out, etc- or going to your current BO, asking if you can take over your horse's care completely (perhaps even for a, say, $10 discount), and start mucking the stall, watering her, feeding her, completely by yourself. In a boarding situation like this- the only way to guarantee that your horse gets the treatment you want is by doing it yourself. Honestly the fact that your horse does not like hoses is something needing to be dealt with, and I PERSONALLY don't think you should be angry with the other boarder for trying to help you out. She saw that your horse wasn't getting what it needed and tried to help. If you don't want her to do anything with your horse, absolutely talk to her and explain that your mare is sensitive and you think it best for her not to water her, but don't be unkind. She probably had no idea and thought she was doing a good deed.
All of that being said, again, I hope you don't feel like i'm out to get you. I KNOW what a terrible situation it is to not be able to afford the care you want for your horse. But sometimes problems like this call for difficult answers. I hope things work out for you.