BC pills can control blood pressure and other chronic conditions.They help prevent cancer.
I have a feeling she just did a quick look up, because BC pils have actualyl been shown to lead to hypertension (increased blood pressure). If I had my choice between a beta blocker or a birth control pill to control high blood pressure, I would almost certainly choose the beta blocker.
I've also read that they can increase the risk of certain types of cancer and have no effect on other types. So, I would guess she's probably unintentially making that up too..