It needs some explaining

S was planning on borrowing a tent-like cover that can be used in the garden to make some nice cool shade. yesterday, G comes to me and says that S has decided that she is not going to borrow the shade-maker and that G will have to explain this to me because I will most probably not get it. She says, "S thinks that the shade-maker will jsut not work in their garden and the way the garden looks is more important than the shade". Yes,k this is too difficult for me to understand. Hot is hot, shade is cool. The shade-maker is even GREEN for goodness sake, just like the lawn.