spots on her back could be what they call "bend Or" spots ..
My morgan x APHA has them,
My registered quarter horse has them,
And My Belgian draft has them(from the Conqueror line) only they are brown in color.Here on her left rump..
Molting could be from arab breeding..my arab has molting around her lips..There are other factors that cause molting..They get a condition known as "leukhotrichia". Heavy sweat, flys and knats cause this...Also DEET can cause this when sprayed in areas...Pigmentation loss can be caused where they sweat heavy..Its quite common.
My paints have striped hoofs...both overo and tobiano's...
Her having blue eyes are a result of her being a tovero coat pattern...since she is tovero...my guess is her roaning is caused from the sabino gene...
I would say she is some sort of pony breed mixed with some sort of patterned horse.. A freind of mine had a shetland x paint cross that looked very similar to your girl...about the same height as well...Her head looks paint and not appy..She might even be welsh cob mixed since she has such a thick throat latch..Appys aren't the only ones with spots...Knappstrupers do too...
There are lots of pony breeds over the pond that have that thick hair like your girl....be nice to see her foal when it arrives! (hint...hint..wink) What was she bred with?