Her ribs and hip bones looked like your horse, but not quite as bad.
My barn owner put her on Fat and Fiber grain twice a day. She got plenty of hay ( it was winter) and every chance I got, I hand grazed her where there was actually grass growing.
I have had her for 5 months now and I think I need to start cutting back on her grazing..
She has become pleasantly pump!
Good luck! So glad she is back with you!