It's been a long time by the standard of BB house, that Paras rightly ditched Shehnaz. But she is still unable to forget it, not because she loves paras, but she's jealous of Mahira's friendship with paras.
1. Bitching about Mahira even without hearing what they were talking
2. Switching on paras ki batti, hinting of resurrecting relation
Shehnaz is extremely selfish and jealous woman who thinks that everyone should run after her. Moreover She thinks if she's with paras she can provide some hot and sexy content. Problem with Shukla is he is kind of creep, he wants to do everything chup chup ke, isiliye gill is not getting any romantic content now, that's why she's angry with Mahira. Her game plan isn't working bcoz of Mahira.
I'm really happy to see a different Paras than the day he came in. it was unexpected then that he can stop giving her any importance. 
She's trying hard though 