If I took that comment and paraphrase it by saying, "Your mother must decide whether to give you a piece of apple pie."; then how is that different that what is above. Your mother still must decide whether to give you a piece of apple pie or not.
There is nothing loading the text. With all due respect, you're not even making grammatical sense.
And if on another occasion she had told me she made the pie for me and all I needed to do come and have some of it, the rest of your tortured logic collapses in a heap.