The biggest factor on why cannabis is unhealthy is not exactly the cannabis, but the smoke. Digesting it is quite healthy in fact. But not to say is does not have its problems, one with a bad heart should not use it. And in some mental cases, it should be refrained from. A women using it for her period is not only good for her, but for everyone else around, lol totally joking, but seriously I wish my wife would give it a try sometime ;)
Friend, you are right, do not try to convince her by telling her that it is a good thing, just tell her the benefits and how you could help her, so that you can intrude her with information. Greetings friend a pleasure ...