This page contains all the information you need on how to have a romance with Kelly Chambers.
Reunite with Kelly
Kelly is a romance option available to both Male and Female Shepard in Mass Effect 3. However, this romance is only possible if you were in a flirty relationship with her during Mass Effect 2, invited her to your cabin at the end of the game, and haven’t romanced anyone else in Mass Effect 3.
If you have done the above, then meet with Kelly Citadels Dock: Holding Area. During the conversation you’ll want to say the following: “Come with me”, “Take care of the refugees”, and “Change your identity”.
Complete a mission, then return to Kelly at the Dock: Holding Area to find out she is now known as Felicia Hannigan. Say “Hot as always” to progress the romance. Now return to Kelly sometime in the future and she’ll apologize for giving info about you to the Illusive man. Response with “It’s okay” to continue the romance.
Return to Kelly after the mission, Priority: Citadel II and she’ll thank you for saving her life by telling her to change her identity. If you didn’t do this then she’ll be killed and romance cannot continue.