Hi, welcome to the forum! Glad you found us!
I'm a bit confused why your mum is sleeping on straw? Do you mean you have an adult house chicken or maybe baby chicks in a brooder in your house? I'll assume you have chickens in your house and your mum is going to visit. If I am wrong please correct me.
Chickens and chicks give off dander. That is bits of skin and down that break off and float away. Some people are allergic to dander. Chickens scratch a lot. They can shred most bedding into dust with their scratching. When chicken poop dries out chickens can turn it into dust with their scratching. These are the things you are dealing with.
We use all kinds of things for bedding in brooders, cops, runs, or nests. Wood shavings, wood chips, hay, straw, sand, dirt, Spanish moss, shredded paper, carpet, the list goes on and on. Someone can always come up with a reason any one of these won't work but others use them successfully. We are all unique, different things work better for different ones of us.
I don't know what is unique about you or what situation you are dealing with. I'd guess chicks in a brooder in your house but that's only a guess. Can you lock that brooder in a room and seal it up as best you can to keep dust in there? Can you brood outside, many of us do even in below freezing weather. You may need to change bedding really often. Without knowing what is going on and what you are working with it's hard for me to make specific suggestions that apply to your unique situation.
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