She did hit Rahul and Ketki once - slammed the door ig hurting them.
Tulsi can just put down a vase where no one is looking and no one is there. Let people come to their own conclusions - whether R is actually mad or there is something going on.
If she wishes RM to be married, its fine. But she has to facilitate it by keeping D 'out' rather than keeping R 'in'. All her efforts are wrongly directed.
Ketki - she can say to M that there is someone around. again, let him think what he wants to or let the rivals call her mad too. everyone against D deemed mad is a good hint.