The hard part is over.
I'm matching you with one of our specialists who will be calling you in the next few minutes.
What kind of smells is she reporting? Rotten eggs? Oranges? Or something else? You might mention it to her doctor, in case something neurological is going on. (I know, "something neurological" is pretty vague.)
From what you said in another post about your mother being anxious, maybe is has something to do with her anxiety, especially if she's reporting the smell of smoke, or spoiled food.