I know the one you mean. Her name is Pisha. She wants the statue from the Museum, and a book from the Giovanni estate.
You start this quest the normal way... you enter the hospital, and the man runs up to you and tells you his crew has disappeared. You investigate, and finally make it to the basement, where you meet Pisha.
Unless Childe of Malkav changed this (which I haven't heard anything about), there is nothing different about this quest. If you have problems, please describe them fully, and tell us what version of CE you are using (1.2, 1.4, etc.) and what version of Windows, video card, etc. Also -- did you install any other mods or patches with this one? That will break the game, because CE is not meant to be installed with any other mods.