Lilitha is a "simple" follower mod, A ghostly follower! She can be found in the Winterhold College, where she once studied.

v1: Initial Release
v2: Moved Lilitha

NOTE: If upgrading from v1, you don't need to do anything more than overwriting. This simply changes where she'll go when dismissed.

Other Mods:
Briinah, The Mini Dragon: http://www.nexusmods.com/skyrim/mods/78511
Marrik, The Ghost Thief: http://www.nexusmods.com/skyrim/mods/79733
Phydra, The Dawnguard Ghost: http://www.nexusmods.com/skyrim/mods/79794