Would you object to your minor teenager using marijuana for medicinal purposes?

If your older teenager (16-17) was undergoing something like chemotherapy and found that marijuana was amazingly helpful with nausea, headaches, and appetite, and used it responsibly, would you object simply because she was a minor and therefore couldn't get a medical marijuana card, so it was technically illegal? Would you understand that it had benefited her greatly and enabled her to actually live somewhat normally again, or would you just freak out about the legality of it? Would you have felt differently about it if she'd talked to you first, or accepted that the reason she didn't ask for permission was that she needed it badly enough she was afraid you would deny it to her so she felt compelled to be sneaky? Oh, and by the way, this girl has never gotten stoned, never driven with it in her car, never shared it with her friends, and got it from a very reliable source, and is a straight-A student with a very promising future and would never use cancer as an excuse to get lit. If used properly, (and she has) marijuana has very less brutal side effects than the prescription medications often given to counter-balance the effects of chemo. It's more natural and healthy long-term, and only technically illegal because of age.