The goddess gave Bani a sign that her sindoor is intact i.e. herr husband is inocent & he didn't betray her. But she didn't get it.
That scene also showed that deep down Bnai still loves Jai. After notcing tthe sindoor she remembered Jia putting it in her maang. But she didn't react with digust or heatred. SHe didn't wipe it off as she did after revealation of ONS. Does it mean she will be confused & it will be hard for her to take revenge on JAi?
Later on the ghat she still had the sindoor. She either didn't take it offf or it was a blooper.