Oh, where to start? She's never done anything that was 100% directed at me but...
She spent over and hour moaning how she had spent 10p on something for DS (which he absolutely adored) because she had picked it up thinking it was free, but, that was after she had asked us to pick up some orange juice and toilet roll for her on our way to her house - which we paid for, and she hadn't even been bothered to buy him a birthday card or pressie.
When I was 33 weeks pregnant, I threatened to go into labour, knowing that we don't have anyone else to look after DS at all, she refused to watch him for us so I could go to hospital because she wouldn't leave her cats for one night. She lives with her fiance so it isn't as though the cats would have been left alone starving or anything. I have had to book a home birth as obviously we can't rely on her for when I do go into labour.
She asked us to buy her a car, we did, £2600, she said she would pay us back £60 a month, over about 8 months we got less than £200 from her, and then she sold it to her friend for £600 and kept the money, we have never seen another penny for it.
She introduced our 4yo son to someone she knew was a convicted paedophile (who I might add she was planning on marrying!) and invited him to our house and didn't think that we would have a problem with this.
There are, sadly, loads more stories about her, but it would take me all day to go through them all.