The Dream

You couldn't be sadder. Your son's in the Army. Your daughter has cancer and your husband just got murdered. Just as you think the world wasn't going to change, it did. There's someone at the door, you open not expecting anyone. It's your son. You begin to ball all over your porch you're so happy. He comes inside and the two of you start to talk when the phone rings. It feels like you've been talking for hours, but it's only been a half an hour. As you pick up the phone, it's an unknown number, you consider just letting it ring, but you have time. When you pick up, this woman on the other end says two short words. You start to cry again and your son gets worried. You shut the phone down and go to the door. As you open it you cry again, it's your daughter. Her cancer's gone! In your head you're so happy, you can't talk. At all. The only things that come out of your mouth are coughs and stutters.

Once you finally put together your words, something else happens. For a second time the phone rings. You answer it, it's the county police. They begin to talk all technical, and then they stop and ask if you're following. Into the phone you say no. He says it in plain English. "We caught your husband's killer." You cry again, thinking that this day is perfect. Something startles you. There's someone talking to you. No, you just fell on the floor, you think as you wake up from your dream. The next thing you do is stop and ___. What do you think she did? Comment with your guess.
CLUE: its 3 letters!