Ex moved out with his daughter end of feb. The daughter's mother (not exactly the brightest button in the box) has had sketchy contact with her since but has been to pick her up from ex's new house twice.
This morning - knock at my door and this woman is shouting daughters name through the letter box 
I open the door, she seems extremely shocked to see me but says hello and asks if her daughter is ready yet???!!! I said "she doesn't live here anymore?" and she threw her hands to her mouth, gasped and said "omg I'm so sorry! I totally forgot! god how embarrassing! you must think I'm a right nutter!! (I'd be lying if I said the thought never crossed my mind but still) " so I laughed it off, remained polite and said "you do know where she lives now, right?" and she said she did. She then showed me a little bump on her head where her dog apparantly nutted her. I remember seeing her post about this on facebook over a week ago.
I don't know what to think!!! the woman is clearly mentally unstable, you can see this a mile off by the stuff she writes on facebook and by text to people etc but do you reckon she did this on purpose for a bit of attention?? Surely you don't suddenly 'forget' where your kid lives??
She is forever making up illnesses with herself, in the past year she has had alzeimers, bi-polar disorder, paranoid scitzophrenia, social anxiety and OCD. She's also hinting that she may have narcasistic traits???
So what do you reckon? nut or genuine mistake?