Jasleen had no malice and she wanted both her and Dipika to give those bands, there was no need for Dipika to rush. she just cares about herself and there was no competition as to who will go first and give these bands.
She could have waited Jasleen to complete because the Happy Club will think that, this was Dipika's idea only and she did not even give credit to Jasleen when she have those bands.
That was a really immature behavior from Dipika's side, Jalsene does know how Dipika is from inside yet Jasleen is respectful of her, but Dipika did a sly behavior where she wanted to be ahead of Jaslene and be in the good books of everyone.
It was both of their idea,so they should had presented it together and not just one person getting all of the appreciation,Jasleen did not had all of this in her mind that, who will take the credit first.
The difference between Jasleen and Dipika is that,Jasleen wanted to share happiness with everyone and her sole intention was to make the Happy Club feel better and share memories of their friendship.But,Dipika wanted to keep all of the attention to herself,so that,Jasleen's efforts are not appreciated, why does Dipika still dislike Jaslene when Jasleen is not even doing anything to her.