User blog comment:SlasherNL/Liara, Bioware's chioce?/@comment-223.165.1.10-20120503124118/@comment-4348913-20120510040301

The reason she was hardly around in ME2 was because the dev's wanted to ensure that no matter what happened she would be alive for the events of ME3. Being an integral character to the series there is no way they would risk her existence and the entire franchise.