I'm a fan of selenium no matter what else is going on, as long as you're not in a high-selenium area.
I don't know enough to know medically why your mom wheezes sometimes and not other times. One suggestion is to put vit C crystals or orange juice with the Lugol's next time, and see if she does any better. I wonder if an all-iodide product would be kinder to her system. Iodine can be rough for some people. When high dosing is done for lung infections, it's always with potassium iodide (SSKI).
I would also caution you about doing it without the proper protocol from personal experience(torment).
My story is the same, used rescue inhalers my whole life, along with nebulizers, steroids, you name it. So, all rescue inhalers are propelled with fluoride(fluorocarbons). They may have bromide too depending on which meds...
Long story short, I took a small dosage like this one, and felt on the brink of death for about 30 hours.
I did no supplements, no salt loading. Don't do it!
I'm now doing it with plenty of salt/borax (to neutralize all my fluoride overload) and feel MUCH better.