She is also the one responsible for programming Yes Man for Benny, with the hopes of using it to hack into House's databases and retrieving whatever information he has hidden. Unfortunately, Benny chose not to fulfill his end of the deal and ended their arrangement once he had what he wanted.
The Moon Comes Over the Tower: Emily Ortal will approach the player outside of the Lucky 38 casino and ask them to bug one of Mr. House's computers in order to obtain medical data. At this point the Courier may accept her request with no reward, or, by passing a skill check (Barter 40), the Courier may acquire several medical supplies from her as payment.
A dialogue option exists in the G.E.C.K. where the Courier could pass a (Perception 6) check to learn that Emily slept with Benny thanks to "sleep deprivation and one atomic cocktail too many", along with sympathetic and mean responses which grant positive or negative Karma accordingly. However, the game was accidentally set to check Emily's Perception, not the Courier's. Using a console command like ModAV Perception 1 or ForceAV Perception 6 on Emily prior to dialogue will allow the dialogue option to appear. (It may not appear till her quest is not completed.)
A dialogue option exists where the player can pass an (Intelligence 6) check to ask how Emily made it onto the Strip. She will explain that the matter of Mr. House's technology was important enough that the Followers managed to scrape together enough caps for the credit check.
When you have finished the quest from her and come back later and talk to her, you are able to keep repeating a speech challenge about how she bugged Mr. House the first time, if you exit the dialogue you will not be able to talk to her again.
During the Barter check, your character actually uses their name in the text. This is one of few moments where this actually occurs.
Benny names her as the Follower he recruited to help reprogram Yes Man, in exchange for letting her study the robotics. She was responsible for Yes Man's helpful personality.
If after leaving the Lucky 38 with Emily present and not previously talked to, and you manage to side step her and manually leave the strip, she will follow you across the entire wasteland and trigger the dialog to start the quest "The Moon Comes Over the Tower". (Just fast travel to any location and wait about 10 hours.)
pcps3xbox360 Sometimes Emily may not appear in game. [verified]
pcxbox360 After bugging Mr. House's computer network, Emily Ortal may not appear outside the Lucky 38, where the quest objective is. [verified]
On PC, she can be made to reappear by typing:
pcps3xbox360 Sometimes Emily will spawn inside the Presidential Suite and/or the casino at the Lucky 38. [verified]
pc Emily can sometimes be found at The Fort, after the drawbridge, where she will make her request for The Moon Comes Over the Tower. If this is the case the player may then need to return there to complete the quest. [verified]
pcps3xbox360 The first conversation with Emily will act as if she's already asked the Courier to bug Mr. House's, and was rejected. This may have to do with the order you do the quests in. (Likely to happen if Benny is not killed at the Tops.) [verified]
pcxbox360 Emily appears at the gates of the Sierra Madre Casino at the end of Dead Money before you travel back to the Wasteland, ending the add-on. This makes the quest impossible to complete as she will wait there, and the player cannot return to the Sierra Madre after the end of the DLC.
On PC, this can be changed using the console. [verified]
xbox360 After completing the quest The Moon Comes Over the Tower, you can talk with her about what happened during her previous attempt of fulfilling her task, and you'll eventually have the possibility of making infinite speech challenges. If your speech skill is 35 or more, you can win as many of these speech challenges as you want, since they make up an infinite loop of experience winnings. [verified]