I don't think this is fair do you?

I'm 17 years old and I make cakes and cookies for children's parties. I made about 200 cookies for my neighbour's child's birthday party. The thing is she's refused to pay me because I did a 'bad' job. I asked her if she wanted me to ice them and she said no. Then when i handed them to her she said she'd asked for them iced when she hadn't. So i asked her what colour she wanted them and she said pink. I iced them pink and she claimed it was the wrong colour but they were pink like she asked. She complained they were all exactly the same size and i exolained to her i did it all by hand so some aren't going to be the same sized as others. After the party when I saw her I asked her if the children liked them and she said no. But her husband stopped me in the street and said they children loved them and he wanted me to do the same but for his son's party and with blue icing and i agreed. But when I went to drop them off his wife refused to let me drop them off and has told me she'll tell the other mothers in the area about the bad job i did even though there was nothing wrong with them. What do I do though because I've not been payed for two batches of 200 cookies and I've had my name slandered.