That sounds about right to me. She doesn't really seem to do anything to justify her reputation other than making the occasional person disappear. Even Fidel Castro could do that.
Also, it goes a way towards explaining why she never leaves sigil (although my personal headcanon is that she's a local spirit of the city, the city's actual soul as it were, and can't leave it; or that if she did leave it she'd become weak and powerless, her power level flipping from being equal to the importance of Sigil to people who live in Sigil to instead being equal to the importance of Sigil to people who DON'T live in Sigil - even those who have heard of it probably don't care unless either it's the only (non-hellish) planar metropolis they know of or they're transporting something across planes that actually meets the parameters to be convenient to transport via Sigil (there need to be known portals near their start and destination. The things being transported need to be small enough to fit. They need to have the correct portal keys. The Infinite Staircase and River Oceanus must not provide a shorter route. There can't be a direct portal. They can't be or be friends with a high-level spellcaster or powerful outsider who will planeshift everything instantly for free)
EDIT:
On a similar note, Lord Ao from Realmspace may be in a similar situation regarding being the spirit of a location