Even babies fake cry to get attention, Ruhi is just going to do everything to get on Shagun's nerves and kids her age definitely have the ability to do that.
Let's be real, it's not going to make Ruhi in to a horrible person is it? She's not going to grow up to be a cunning woman because of this one incident. She's just teaching the vamp of the show a lesson.
root case of this attempt of ruhi is revenge .that is not appreciable . right now its childish but later it does have risk of getting more risky
just because her character is positive does not mean her all activities would be welcomed by ALL viewers