Offhand, it comes to.. hm.. :
In Whiterun, she voices Adrianne Avenicci the blacksmith by the city entrance, Aela the Huntress in the companions, and Uthgerd the Unbroken in the inn..
In Riften she's the voice of the Jarl Laila Law-Giver, aand the voice of Iona, the housecarl you get when you buy a house and become Thane..
In Solitude, the Legate Rikke, and Bryling one of the Thanes, and in relation to a Solitude quest, the voice of Queen Potema..
In Dawnstar, Brina Merilis...
In Markath, it happens to be Faleen the housecarl to the Jarl..
In Windhelm, Voldessa Giryon the dunmer "pirate", and Adelaisa Vendicci the Imperial soldier who can become a follower,
In Falkreath, Zaria in the alchemist's shop
There's Sorli the builder, oh and the ghost of Breya in some Dwemer ruin..
I don't think it's so much that they re-use her as a voice actress, it's that she's not just voicing bit players, but a chunk of "important" one's that you'll talk to repeatedly in the course of the main story and the other story-quests, not simply odd miscellaneous quests you could easily miss.
Stalk her much?