Coming down to Sharon getting more screen space, I hope u remember that when Swaron started, Taani had made her entry in the show and we Swaron fans also had the same complaints that since Swaron had just started they should get more screen space rather than Taani being included in every other scene... The production house does it to establish the person in the show.
Now coming down to Sharon's blurting of Rey's no., was natural coz she was trying to remember and wen c finally did nd recognised d thng, she blurted it out in xcitement nd unfortunately she was not alone...Yes!! D part wich was avoidable was girl's calling their respective boys, this looked a bit over-stretched and unnecessary to me, which finally gave the secret away.