A quarter (1/4) of the work is done in 2 days. Let's break it down:
Work can be finished in 8 days total so with 2 days it is only partially completed. If we set it up as 2/8 we can simplify to get 1/4. Therefore, we know only a quarter of the work is done so far.
If you divide 280 by 6 then you can find that the answer is 46.666(repeating). This means that she will have an amount of toys left over that has a total number less than 6. This is why she would only be able to make 46 bags of toys.