OK, I don't know if there's something I should do. I've known this customer for about 3 years. She's an older lady who regularly bought cigarettes in our store and was completely normal and decent lady. During last year, I can see a rapid deterioration of her cognitive abilities. At first, she couldn't remember the name of her cigarettes, but it was not a problem, because I knew what she wanted. Later, she didn't understand the difference between cents and euros- she gave me 3 cents and absolutely couldn't understand that I need 3€. In the last months, she tried to pay for a whole pack of cigarettes by giving me 2 cigarettes back. She was totally confused and didn't understand the problem with that. Today she couldn't even talk. She spoke like this :"give me such thing ... So I can... You know... (miming writing using her hand) I asked if she wants crosswords and she was like yes yes. I gave her some to choose from and she was like "no... I need that... That... He will scold me for these" (miming what looks like reading now) I give her the most popular woman's magazine and she wants to take it. She gives me 2 cigarettes instead of money. I explain I need money. She then lifts her shirt up and shows me several cigarettes hidden in her bra saying "this is all I've got! So you won't give me this?" I say no and she leaves very confused not understanding what I want. I'm concerned that this lady walks in the town alone without supervision. I'm afraid she might get lost or something will happen to her. I don't know her name or where she lives. Is there something I can do for her? Should I call someone (who?) or should I let it be?