Trivia: Sidney makes a brief passing reference to having a husband named "Mark." After hearing much fan speculation, the directors confirmed that her husband was meant to be Mark Kincaid from "Scream 3," as played by Patrick Dempsey. Unfortunately, this was subsequently ret-conned during production of the seventh film when Dempsey was unable to reprise the role of Mark Kincaid due to scheduling issues and the California wildfires. Sidney's husband instead became an original character named "Mark Evans."
Trivia: Originally, acclaimed director Rian Johnson was meant to have a cameo in the film as the director of the fictitious "Stab 8." He would have appeared alongside "Scream 4" co-star Hayden Panettiere as her character Kirby in a short scene. However, scheduling conflicts prevented this from happening. Nevertheless, a photo confirming that Kirby survived "Scream 4" is briefly shown, and Panettiere has a small voice-over cameo during the party scene alongside other cast and crew from the series.
Trivia: MAJOR SPOILERS: Courtney Cox was heartbroken when she read the script and saw that Dewey got killed off, since he was such a likeable, positive character. She tried to talk the directors out of actually killing him by throwing in a last-minute twist that he was still alive, such as her getting a text from him at the hospital and revealing he wasn't the one in the body-bag. However, she ultimately agreed with their decision to kill him off, since it raised the stakes.
Trivia: When the group of friends are first introduced, if you look closely, Wes and Amber are snacking on a bag of grapes. This is a bizarrely specific reference to a scene from the first film, in which Tatum and Stu are also seen snacking on a bag of the same type of grapes. SPOILER ALERT: Just like in the original film, one of the people eating the fruit (Amber) is one of the killers, while the other person (Wes) is a victim.
Trivia: During the scene that reveals Kirby is still alive via YouTube link, if you look very closely, you can also see a link to a YouTube conspiracy video called "Did the Real-Life Stu Macher survive?" This is an easter-egg referencing a popular fan-theory that Stu actually survived the original film and would return as the killer in a future installment.
Answer: To try to throw them off the scent and add suspicion to make us think maybe possibly they're the killer(s).
This answer is literally part of the question. The question mentions that this was done to make the character seem suspicious. The question was asking why, in the context of the film, can't Liv go to see Tara. Not why in a behind-the-scenes sense.
TedStixon