Forum:Diana Allers romance question

Ok, so I was trying to romance Diana Allers but was stone walled after the third interview. I read after the second interview, if you don't cut the interview short, she'll make a pass at you and you can initiate thee romance then. After the third interview, the romance should continue. However, this didn't happen for me. Instead of saying she'll do it later she insisted that she go work on it now. I thought this might be that I already have a love interest with Tali, but in my first play through I believe I already had a romance going with Liara and still was able to initiate with Diana. Anyone have any ideas why this happened?