Out of 1-9, I would give her a 3.5, she could defintely use some more weight and she looks pretty thin from the behind picture. Muscle tone would help increase her score as well. Other than being thin and not overly toned, she's a very pretty lady!
Well she's worse off than my mare that the vet just scored at a 4 so I would say a 3/9.
Her back end is still slightly sunken in, hip bones protrude more than they should, ribs are visable. Her back appears to be sunken in as well. That is the last to go. The dip on the withers is what says to me she is sunken in there.