Advice plz

So my husband is friends with my cousins boyfriend, so he likes to hang out at there house an what not, watch tv an other stuff when I'm running errands. But lately when they would get into arguments or fights (physical fights) she starts calling my husband phone an texting everything her bf did. An my husband just says "what am I gonna do, you need to call the police" an then she will quit texting. My husband had never been physical so he doesn't like what his buddy does that but what can he do. An the last incident she called him at 3 in the morning an was like I was trying to call you. An this went back and forth for 20-30 min An he just told her on the phone "i am not going over there, you woke me, my wife, an the baby up, all I'm gonna do to help u is send the police over there". So she quit texting cuz she won't get her bf in trouble even tho we talked to her numerous times. So at that point I told my husband I don't appreciate him talking to her, cuz I am her cousin an if she needs help she can call me . An he respected that an hasn't talk to her since or just tells her to text me. But my problem now is when we drop him off for like an hour or two to hang out with his friend she is wearing short short booty shorts an following them around outside, an it's 50 degree weather. And I dont know what to do, she is driving me nuts, an she is 32 an me an my husband have been together for 10 years this year.