Oh yes, her feeder is on the ground, she still walks away as soon as she realizes it’s a mash. We’ve been playing with liquid amounts, different flavours and time of day, everything we can think of to make it more palatable, but she’s stubborn.
You have probably already thought of this but going to toss it out there anyway (and it does not answer your original question). My old man turns his nose up if his mash is at all rancid (for a lack of a better word, though rancid is far more extreme sounding than it is). In other words, if the feed/soaking container is not completely cleaned every meal, the next meal is not edible. He is not this way about dry grain meals, he will eat out of the yuckiest thing in the barn. But wet meals everything must be clean every time.
Edit to add - clean does not equal (to him) swished out with water so things look mostly clean. Clean equals no hint of previous contents at all. I use one of those soap dispensing dish sponges.
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Just some random thoughts:
Have you tried her wet mash with NO medicines or additives?
The cushings med can cause some horses to go off their feed, IME.
Have you tried sprinkling Sweet Feed on top of wet mash? My guys will gobble anything w/ sweet feed on top.
Any chance she could have ulcers?
Will she eat her rations dry? Dry w/ medicines?
Gatoraid powdered Red Fruit sprinkled on top of feed helps here.
Will she eat good quality Alfalfa Hay?
Sorry you’re having problems w/ her, it does make ya worry doesn’t it.
You could try adding some ground fenugreek powder to her feed. My picky Cushing’s gelding doesn’t like molasses or kool-aid or jello powder or any of the “normal” things people add to feed to entice a horse to eat. But he doesn’t mind his chasteberry, ate tumeric with no complaint, and LOVES fenugreek 
You could buy a small sample to start at any grocery store that sells bulk herbs. Otherwise it can be bought in bulk online. Not all horses like it, but those that do seem to really love it.
There are boarding barns in my area that offer year-round irrigated pasture. There’s one near Vacaville with one-acre single horse irrigated paddocks. I believe it’s Horse Haven Ranch. Another in between Dixon and Vacaville has irrigated turnout but also specializes in Senior horses and horses with Cushing’s/laminitis. It’s called Little Wing Stables. I’m guessing they are both in the $400-$450 per month range.
If the field is large enough, and/or winter rye is planted, Florida would be doable.
