I see lots of testimony of two-br flats with energy (gas plus electric) running less than $150 per month. That would be about $300 a month for a 3/4 br. Me thinks that there is more to the story.
I might be a bit off on the size of the flat. Or, perhaps she was angling for some money from her dad. But I doubt that. From a young age she knows she that she always had to pay her own way for things like that.