I didn't get it
Gayatri told Namrata to put the red chunni on Suhana, but that's the bhabhi's job.
Anu saw Namrata doing it and looked poisonous. Why does she care? She's glad to get rid of Suhana, and she hates the family anyway, and doesn't want to be involved.
And in a way, Gayatri kinda did the right thing cause Namrata is technically Suhana's big bhabhi.
Yuks