All event girls are worse than non event 5* girls. Even Edeweiss has a flaw: her skill activation is 23% at lvl 5. This is inferior to many 5* girls at lvl 1.
In fact all girls with good stats (Edeweis, Lachenaltia and Lavender) have bad skill activation (23%), while the girls with lower stats has 30% activation.
When a non event girl has lower stats than a event girl, look at the skill activation and buffs to see where she overcomes them.