Do you have to have the Dawnguard dlc to do this quest as she she has a copy of the book you need to read on her dead body

As soon as you have read the book The Aetherium Wars you can go to the ruins and begin the quest.

The book can be found in many places in the world now.

edit: but yes, you need the actual DLC installed

Yes you do. This quest is added by the Dawnguard DLC.

lost to the ages was added with Dawnguard, as such Dawnguard must be active to do it

thank you, will re-download it after I finish "Dragonborn"