Gigi Hadid's mom, Yolanda Hadid, claims Zayn Malik "struck" her last week, and she's strongly considering getting the police involved.TMZ said that the former "Real Housewives of Beverly Hills" star is telling friends the incident involving Zayn occurred last week, but the webloid doesn't know what exactly triggered the alleged violence against Yolanda, the grandmother of Zayn's daughter, Khai.The One Direction singer, who shares the 1-year-old with Gigi, has acknowledged that something