I feel like I'm in a no win situation... my fiance comes over with his daughter from a previous relationship and I…

I feel like I'm in a no win situation... my fiance comes over with his daughter from a previous relationship and I really don't think he feeds her much. She always seems hungry when they come over. We don't live together, but he and I have 2 children together. With both of my kids in daycare now money is tight for me; I simply cannot afford to feed everyone by myself. I think the situation would be different if we did live together because both of us would be chipping in and buying groceries. I feel bad though, because I think she's hungry when she comes over but I fear that I don't have enough to go around. She's a picky eater too, so I don't think she'll even eat my "poor man" meals (tonight I just made roasted potatoes, I might make some corn to go with it).... idk what to do any advice???