Based on your daughter's score, a placement one year ahead would be appropriate.

You want to skip to the level just above where mastery has been achieved, and scoring at or above the 90th percentile indicates mastery--students scoring at the 50th percentile have *not* mastered grade level material.

Looking at the RIT score tables, a fall score of 220 equates to just under the 90th percentile (89th, actually) in fall of 4th grade, so if she had been placed in a 4th grade math class in the fall, it would have been appropriate.