Full Care doesn't include fly masks, blanketing and so forth usually.
If you want him to have a fly mask, ask her how much the charge would be.
As far as storage, weren't you aware of the lack thereof BEFORE you moved your horse there? It's not like a storage building grew wings and flapped off the day you moved in.
You can't realistically expect her to not have more boarders just because you don't like other people and told her so. It's HER facility, if she wants more boarders, that's her business.
If you don't like people, buy your own property and then you can do what you like with your horse, exactly the way you like it done and you don't ever have to see another soul.