You can find her in solitude after you help out 5 villagers with their issues. She's basically the housecarl of Solitude for you.
In hindsight I probably should have made Senna daedric god tier but she wears that hood so who KNOWS what she actually looks like. --- They might as well just advertise it as a date rape drug at this point. -Lt.Storm on AXE Deodorant