My sister started out in the same Computing program that I am currently in, she managed around half a year until she switched to a law program.
She was doing quite well, better than most she was told when she left.
She left saying that computing was boring for girls, she had no outside interest in the subject and struggle to get into the right frame of mind for computing.
Look at this, computing is boring for girls. Her words not mine, if you look into the social stigma behind computing studies. I get called a nerd or a geek when people find out about my degree, it is even less cool for most girls to get into the subject. I honestly think there is a much stronger social side, where woman and young girls just do not want to get into this field.