She gets shut down relatively harder because most players rely on
Burst of Speed for damage, once it wears off she becomes harmless and super squishy without regenerated health from lifesteal.
ONE well timed CC will shut down most of her DPS for ~7-8 seconds, and another CC that isn't a slow will stop her ult.
Comparing
Rapid Fire on
Tristana with
Burst of Speed on
Fiora. If they both get
Pulverized,
Fiora would have a harder time recovering with ~1.5 AS, while Trist would have 4-5 seconds left at 2.3 AS.

ONE well timed CC will shut down most of her DPS for ~7-8 seconds, and another CC that isn't a slow will stop her ult.
Comparing






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[...]and can be stopped by CC. [...]
No. That's a terrible reason.
Every champ can be stopped by CC. But then,