How do u get Morinth in mass effect 2?

Alright i have tried 3 times in a row to try to get her, and no matter what i end up with Samara. plus i get my Renegade level to i know their is 5 levels to reach 100%.. How do u get it to 100& or a higher level to get her daughter... should i wait after i defeated the collectors or what??? i have no idea.... i have been trying and no matter what i look for the answers online, but still it doesnt help. i need better answers.. plz can someone thoroughly explain how to get Morinth??? should i transfer my Renegede from ME1?? will that work???