Should I be getting mad?

So my boyfriend has this friend. . she's a girl, and she dates my boyfriends best friend. Well the girl and my boyfriends best friend be having some rocky times. . like he's cheating on her, but ofcourse she doesnt know, and my boyfriend told me, abut he doesnt want me to say anything to her about it ...because its not "our" business. So since she is my baby's friend, I tried to befriend her, ya know? like since our boyfriends are so good of friends i guess it would be only right that we had some sort of relationship between us. Anyways, the problem i am having with her is she's TOO friendly & too comfortable. I found out from my boyfriend that she calls & texts him all the time , talking about her "issues" with her "boyfriend" who dont even much like her. and asking my baby if he could pick her up to go see her boyfriend and everything. I don't really think it's appropriate for her to be calling/texting him at all hours of the night like that's MY boyfriend, it ain't my fault if her boyfriend don't wanna talk to her. Also I dont like for her to be hanging around with my boyfriend so much like that . . they friends and thats all they should be. Me being a girl, im starting to think she's developing a crush on my boyfriend soo im trying to figure out what i should do. Should i tell her i dont like how she talks to him so late . . and always calling him and stuff . . or should i just pop off on the girl and hurt her feelings ? I'm starting to get irritated with this girl . .