Is It Normal To Masturbate 3 Times A Week For A Female?

Hi meet a nice girl and I have plane to marry her, but I find out she had sex with 9 guys before me. and she loves to do masturbating 3 times a week. I don't know is that normal or not. because I didn't grown up in American culture and I have been living in USA for 5 years, but she lives here for 11 years. she is 31 and I am 37. would u pls to help me to understand is she doing right?