Oh, hey,
I thought I recognized your name.
Supernatural Sense is definitely what I'd use for Skitter's swarm sense. Her senses are definitely more potent than what one sense is supposed to offer, so I'd charge 2 or 3 Refresh for the Skitter package. Either by breaking her senses down into multiple different senses or by charging extra for one extra-strong sense.
The mechanics for Supernatural Sense are pretty loose, so questions of range and the difficulties of rolls will need to be worked out between you and your GM.
IIRC there a custom power in the master list that essentially modelled it as Beast Change/True Shapeshifting. Essentially, it let you re-allocate your skill points across all categories, including social and mental ones. The justification as that by focusing on it, you can gain general knowledge of how to do something.
I checked the list and didn't find the Power you're talking about. There is a mental Beast Change equivalent called Composite Personality, but I don't think it fits intellectus very well.
Intellectus of War and Eye Of Providence are kind of intellectus-like, but they're not mechanically like Beast Change.
PS: I missed your reply in the RPGnet thread, Ursine Enigma. So here goes...
-I don't think Human Guise is necessary because Taylor always looks human.
-Sponsored Magic doesn't really fit Taylor because Taylor isn't a spellcaster.
-If you want an IoP-like limitation for Skitter's swarm, you might want to try out the Limitation custom Power. It's on the list.
-Be careful with Venomous, its mechanics are a bit vague and given the way you're using it there's a chance it might be unfair.