At 13, Sasha finished 4th at Pacific Sectionals as an Intermediate (there was no Junior Nationals in those days).
Actually, the national competition for juveniles and intermediates started in 1991. It was originally called "Juvenile/Intermediate Nationals" which is a bit unwieldy but has the advantage of clarity. In the mid-90s, when Cohen was competing there, it was called "Junior Olympics."
http://www.usfigureskating.org/AthleteBio.asp?id=2265
Here are Cohen's early results from her USFSA bio. She was intermediate the year she turned 12, and novice the year she turned 13:
1998 State Farm U.S. Championships, Novice - 6th
1998 Pacific Coast Sectional, Novice - 2nd
1998 Southwest Pacific Regional, Novice - 2nd
1997 Junior Olympics, Intermediate - 5th
1997 Pacific Coast Sectional, Intermediate - 4th
1997 Southwest Pacific Regional, Intermediate - 2nd
1996 Southwest Pacific Regional, Juvenile - 4th (juveniles didn't go to sectionals, and only top 2 from each region went on to the national event)