Meet with her all three times.Read Hackett's information on Kai Lang in your terminal.Warn her about Kai Lang (Spectre Office)Agree to give her funding/support/whatever to find her sister the third time you meet (room on the Commons).
I'm under the impression that you need points, like this is Harvest Moon, to be at a certain level so she survives. I romanced her in ME2, did her loyalty, she survived in ME2, but broke it off with her in the beginning and did all the stuff Igot said, but she still died.
Maybe if you didn't romance her in ME2, you don't have to blow her off early, so you might be ok later on. But be careful with how you deal with that relationship >.>