Melissa days plan.

Melissa just decides to sit on the sofa. Meanwhile she sees how Lisa gets dressed.

Lisa: "I am just going to the shop. Will be right back."

After Melissa hears the car take off she already has a smart plan. She fills up the pitcher with some ice-tea and then puts in some sleeping pills and puts them inside.

Melissa knew there was actually a possiblity Lisa would not fall for this. But she had even more plans if this one failed for her.

Once she is finished she hears the car drive up the lane again and Lisa came inside the door.