I am trying to find a movie title from the plot?

In this movie, Its late at night and a family is sleeping. However, robbers brake in the home and hold the mother, father, and brother hostage. While the big sister and the baby sister are upstairs and terrified... She tries Going on the computer to send for help but the person she is talking to on the computer thinks its a prank. eventually, she kills (i think she does lol) the intruders ...after battling with them for several parts of the movie. Also..I remember at one point they were on the roof.. and on the side of the house was kinda like a white lace fence.. (i think).. Please Help me out!! lol I really want to find the name of this movie!!