I need advice.

My friend became sexually active this past summer and right from the beginning she wasn't using any protection other than the pull out method and Plan B. I've had to get her the Plan B pill 5 or 6 times and I know she's had others get it for her also. I know that taking the Plan B isn't the best thing for your body, nor is it good to take take it every time you have sex. I don't know what to tell her to get her to understand. She refuses to get on BC because she doesn't want her mom to know she's sexually active. Can anyone give me advice on what to say to her?