She's simply saying what's true. Simar wants to be mahaan and Mrs Fixit to everything, without people wanting her help. The murti incident, Roli was right, Simar just needs a reason to act all big and helpful, that smile and nod when she caught murti - says it all, she loves being praised for fixing everything while the other person is taunted. Then she goes and says sorry she didn't mean to get them in trouble. PLEASE!
Roli should teach her a lesson before she finds out who the real culprit is. And make Simar realize that she doesn't need to act mahaan all the time. It's okay to live on the ground and make mistakes sometimes. It's also okay to not be liked by everyone because that is upto an individual.
There is nothing negative about Roli at all.