Common sense and logically thinking is limited in the CV team.
Sid postponed shelly trip and yet she reached Mumbai before him and Abha.
She drags Karan out of the bed and window at the same moment Abha was ringing the bell. It is a great coincident that Shelly knows when Abha is coming.
Abha sees the room where Karan was. The machines were running and yet she accepts that there was no one in the room. She sees Shelly's purse on the bed and accepts the Dr.'s mother explanation that it is of her daughter.
A normal and driven person would wait for the doctor. If she was not allowed to be in the living room, she could have waited outside on the footpath!