Hi Jado,
It's hard to know how to help with this. Advertising or posting an outside link is not permitted on this site, so no one can directly send you to a place to get these things. My understanding is that cannabis is still regretfully illegal in the UK....correct me if I am wrong. So bringing it in is going to be tricky, it cannot be shipped to you, and I don't think we can help with how you can get it or where.
Also, as I stated in my other response to you, smoking or vaping is a very bad idea, as it's damaging to the lungs even in a person whose lungs are not already compromised. If you can somehow get hold of it, I recommend tincture and/or edibles. Smoking or vaping will only exacerbate the problem in her lungs.
CBD oil is easier to get, but I don't know how it would help with lungs. Maybe there's a way it could? I don't know. You could google it and see if there's any info on that. I use medical cannabis and CBD in tandem, but I also use a salve that is only CBD which has been surprisingly helpful with pain areas like my back and hands when I rub it in the painful area. I don't know if you can get it where you are. But if you could, maybe try rubbing it on her throat?
Sorry, don't have anything more to offer. I have never heard of fibromyalgia of the lungs.