If your sister is staying with you, the discount is 50% at hotels. If she’s not, then it’s 40%. There are no packages you can get that include free dining as far as I know. Sometimes Disney will offer specials that your sister should be able to see by accessing the hub. Right now there’s an offer up for 60% off hotel rooms if the cm is staying there, 50% if not. And you can add the ddp for a discounted rate. But it’s for select nights this summer. These offers come and go just like the ones to the general public. Hope this answers your question!