I've been a single mum to two children.
I decided not to iron anything that didn't really need ironing - my mother ironed everything and I actually like the ironing - but I didn't have time if I wanted to spend time with my dc.
I liked travelling so I would by budget items in the supermarket shop and I would make every meal and save. This meant come the summer holiday I had a job where I could get 4 weeks off - so id go to Europe with the dc
These are choices I made and nobody quibbled about them.
yes I kept my house tidy and cleanish, but these were my choices - not friends or parent, one died so only had one parent.
In the kindest way you have to stand back and allow your dd to make her own life choices - is her sons hair a problem? is she making sure his clothes get every last bit out of them before buying new or second hand? Whatever the reason, they are her choices.
If her son is clothed, feed and warm at night with a loving mum - stop
think to yourself, is she harming her child? is she taking drugs? is she drink driving to school every day? if the answers are no - stop interfering.
If you want to clean her house - then ask before you do so - say would it be helpful if I gave your house a fairy clean for your arrival back on Sunday night? As I know you're busy and it might be a helpful gesture.
Get yourself a volunteering job or a hobby 🤗 and stop worrying about dirty tea towels, it will be fine
as an aside my adult dd has less than tidy house and I don't like it but I don't have to live like it - I do understand