14 Emilias? You should get:
CR:
1 Guaranteed (2 used, original and 1st fodder)
50% chance for next CR = 2 for this one (4 total, original + 3 fodder)
25% chance for each subsequent CR = 4 for 3rd CR (8 total)
4th CR: 12 total
So on average, you should have Cost -4, 50% chance of perfect -5. After CC UP cost: 11, maybe 10
SU:
1 Guaranteed (2 total)
75% chance: let's call it 2, be a tad pessimistic (4 total)
50% chance: 2 more (6 total)
25% chance: 4 more (10 total)
4 extras if things aren't on average
Average Result: 5/5 skill
Thus you should be at -4 UP, 5/5 skill, with a potential -5 UP if u get lucky, if you go by averages
Now that said, how does she compare to your mentioned duelists?
As a duelist: You drop her in advance or everyone besides Kerry mops the floor with her. If you can do so, she'll rock the target enemy better than any of them (her stats during skill are better than the Black Valkyrie Clissa) except against high defense enemies where Sherry and Claudia's magic damage will outperform (though her defense will be higher to take hits)
As a lightning rod: Loses to all of them due to HP
As a UP ramp: only Kerry is competition, Kerry is a better UP ramp AW without Skill AW due to much higher attack to one-shot the weak enemies that are prevalent early in maps, after Skill AW Emilia wins easily
Conclusion: She will likely outperform Kerry unless you get unlucky with your combinations, the rest are generally preferable as duelists since they do not require advance deployment to function as proper duelists. She'll either make your team as a Kerry replacement or you'll keep one copy for harem completion purposes and use the rest as lesser platinum armor fodder (recommend for Sherry, Claudia and Imelia)