Ricci is a Tovero also.
Her blaze that's trying to spread across her forehead is an Overo characteristic.
Overo: Head markings are distinctive, often bald-faced, apron-faced or bonnet-faced.
Tobiano: Head markings are like those of a solid-colored horse--solid, or with a blaze, strip, star or snip.
Her blue eye(s), of course.
Here's the Tovero definition again, according to APHA at least:
(pronounced: tow vair' oh)
Dark pigmentation around the ears, which may expand to cover the forehead and/or eyes.
One or both eyes blue.
Dark pigmentation around the mouth, which may extend up the sides of the face and form spots.
Chest spot(s) in varying sizes. These may also extend up the neck.
Flank spot(s) ranging in size. These are often accompanied by smaller spots that extend forward across the barrel, and up over the loin.
Spots, varying in size, at the base of the tail.
The most common sign of Overo vs Tobiano is an Overo won't have white that crosses across their back between the withers and the tail. That is probably what you are thinking of. There are other things to look at too though.
It is up to if you want to keep her reg'd as Tobiano or go for Tovero. To some people it matters, some it doesn't.
As for the specific color genetics... weefoal has the answers :)