More thanks to everyone.
All mum's clothes are labelled, apart from tights. Yes strange clothing has appeared in her room which she now thinks is hers. I did an inventory when she arrived, but things change, new clothes bought, old ones taken away and there is no list anywhere to update.
I have made friends with the laundry lady, but clean laundry is sorted by the night staff - it is in the sorting that it goes missing. Or by whoever puts it back in her room.
Mum's clothes are not clean anyway, she doesn't really bother, so I don't either, but I think staff should be suggesting that certain things get washed rather than leaving it to mum. She is quite capable of wearing the same knickers for a week, the same bra, and not washing a skirt for six months.
I can't do it face to face, it will have to be a letter to the manager. Friendly, if I can manage it.
Thanks everyone, much appreciated.
Margaret