I’m the one who loses stuff in my family. I know how frustrated people get. Good luck.

Edit: Mr Lake makes an inventory when we leave the house.

If I drive I have to give him the keys immediately after.

I don’t handle much money.

Every time I leave a store I check I have wallet, passport, glasses, keys before I leave even if I didn’t use them.

If I used a credit card I have to look in my wallet to make sure I put it back.

Even so I can lose those car keys walking into the house.

I haven't used them myself, but perhaps something like this can help?

https://www.nytimes.com/wirecutter/reviews/best-bluetooth-tracker/

I had a problem with this but it's not nearly as bad as it was. I had to develop habits to keep things in the same place all the time. I am also the one that suffers ALL the consequences of my lack of attention to important things like glasses, debit cards, etc. No idea if that is an issue or not. I'm sorry for your frustration.

Wallet, phone, eyeglasses, keys, jacket, gloves. It is now so routine it is automatic and just takes a second.

losing things that I might have had in my hand just minutes before. I get frustrated with myself! So I can imagine how this person feels. One of my sons tends to lose things and I have been very understanding about it because, well... me.

Having the same spot for something really does help. I even tend to park in the same spaces when I shop (pre-pandemic).

If I don't sort my mail immediately, I am doomed.

hopefully your daughter will get better