Shay-
Sorry to hear she's having a difficult time. If you decide to stay with the Colistin you may want to contact CFF Compass. They can help with insurance issues. They may be able to talk to your specialty pharm. to get them to agree to cover Trio metal head every 3 months:
https://www.cff.org/Assistance-Serv...e-Plan/Find-Resources--CF-Foundation-Compass/
If you decide to give Cayston a try:
It took me awhile to get into a routine to fit in that afternoon dose. One thing that helps is that the doses only have to be 4 hours apart. So even if you missed your afternoon dose, you can usually still fit in all 3 doses as long as they are spaced 4 hours apart. Another helpful tip if you decide to have her start on Cayston, is to purchase 8 rechargeable AA batteries. These last so much longer than the regular batteries and when they do need to be recharged, I have another set ready. This helps to make it easily portable since the afternoon dose is more likely to be done when your not at home. Although it's stored in the refrigerator, it can be kept at room temperature for 28 days, so you don't have to worry about keeping it cool.
Here's a link for a free carrying case:
https://www.cayston.com/resource-center/nebulizer-carrying-case/
Somehow my insurance covered an entire extra Altera device so I just keep this case filled with everything I need for on the go. I'd call the company to see if your insurance would cover this. Because it increases compliance, some insurance companies agree to it.
I don't think your specialty pharm. would give you a hard time about paying for a new handset and metal head every month, since Cayston is only FDA approved using this device. (unlike Colistin).
If they do give you any problems, I'd call the Gilead directly and ask for their help getting it covered.
Good luck with whatever you decide and I hope she's feeling better soon