Why would you consider Regionals and Sectionals "more recent"? Regionals were 10 months ago, and Sectionals 9 months.
10 months ago is certainly more recent than 2002 and 2003.
What you forgot is not only the PCS multiplier difference, but also the fact that the Junior programs are longer than the Novice programs (SP 8 vs 6 elements; FS 12 vs 10 elements) and the fact that Junior Ladies attempt more difficult jumps than the Novices do.
No, I didn't forget any of those things. Note that the juniors attempt more difficult jumps because they are better skaters than the novices, not necessarily because the rules disallow novices from attempting more difficult jumps. And it's not just more skilled at jumping, juniors are more skilled in all facets of skating. Calculating how much more skilled the juniors were than the novices is where your "discrepancy" calculations are lacking. Perhaps you forgot that as Marisa improves, so will the others. To determine how much more skilled the juniors were, take the differences you calculated and reduce them to account for the different rules.
Let's look at the scores for the 2007-2008 season of the most likely candidates. For personal bests scores, I've noted the event where it occurred.
Ellie Kawamura
junior: 122.74, 141.06 (pacific sectionals), 140.21
Kirsten Olson
junior: 130.21, 148.68 (midwestern sectionals), 138.13
Victoria Rackhohn
junior: 118.68, 137.70 (nationals), 129.04, 127.50
Marisa Secundy
junior: 114.01
novice: 104.77, 110.38, 122.96 (midwestern sectionals), 108.52
These scores can be found at:
http://www.tracings.net/usa.html
Let's adjust their personal bests scores to account for the differences in the rules between the junior vs. novice division. The protocols for those skates can be found at:
http://www.usfigureskating.org/Events.asp
After eliminating the extra elements that the juniors did compared to the novices and adjusting for the PCS multipliers, I get the following novice-ized scores:
Ellie Kawamura at pacific sectionals: 129.47
Kirsten Olson at midwestern sectionals: 132.88
Victoria Rackohn at nationals: 120.17
Marisa Secundy at midwestern sectionals: 122.96
Ellie is age 14 old and she is scheduled for Goldenwest. Kirsten is age 16. I don't know what her summer monitoring was or will be. Victoria is age 15 and she scored 118.68 at Gardena and is scheduled for Goldenwest. Marisa is age 15 and she scored 114.01 at Liberty. (All of these scores are at the junior level, so no adjustments are necessary.)
So if Ellie scores better than 114.01 at Goldenwest, which I believe is highly likely, IMO she should be placed ahead of Marisa. For Kirsten, I'm looking for a 130+ score, which is likely. For Victoria, a 125+ score. These score levels can be raised as we get deeper into the year.