After she charged me 2.99 for children blanket .sh...

After she charged me 2.99 for children blanket .she keept looking at it and change the price to 5.99 . I asked her why she changed the price .she said its a twin bed cover , it was a tinny blanket .i guess she wants it for her self .
They need to put prices for every thing , cuz its not the first time it happened to me