She is Not.
The game she is playing:
"She's Trying to Break Sid & Paras Friendship or Association" whatever you call it.
Both paras & Sukla becomes weaker as a result, if seperated at this stage; if Shukla is weak, that helps her chance of winning too.
Then go to Asim & Damage him, so that, she has a bigger chance of winning.
Why She Wants That:
Firstly She Will Take Revenge on Paras & Mahira.
Secondly Isolated Shukla will give her more attention & Importance.
Weakened Shukla will listen to her much more. When decisions are made & she can play according to her strategy.
Why Does She Go & Cry With Padosan:
This is her pressure technique & keeping the relation cordial to switch if needed.
An effective way to say things you can't say direct. đ She's just using padosan, so the padosan should not be thrilled & start thinking she's unbiased & very good, it's actually opposite.
Can She Switch Side:
Currently no, but their could be a time. If she could she would go today, when she said today to Sid that they are not going along well, why did he enter into her argument into paras? Shukla immediately took the lead and told her to go to other side.
Shehnaz was checking his loyalty & brain both. She found out that Paras is important than her to Shukla in the game. He straight way told her to go to other side. But then she dropped the issue completely.
If she changes side now, she will lose the integrity of her character completely & even later, this will be a big risk for her to pick up a romance with Asim or Vishal, if Paras & Sid is in the house. Unless there is some serious problem between Sid & Sana to justify that. She's trying to create this justification.