dd is a picky eater too.
i focus on getting good fat into her mostly. i also try for protein, but she usually refuses.
i try to make my own bread, with ww flour, a few eggs, butter, yogurt, sea salt, maple syrup and a pinch of yeast and then let it rise for about 12 hours (i don' thave the mental capacity now to keep up with a starter).
that way she is eating bread with more protein and fat in it. when i don't make it, i do my best to have plain ww sourdough on hand, so dh doesn't bring home the white bread, which she'll eat half a loaf.
she loves pb sandwhiches, i should try adding coconut oil to it. great idea!
she used to love eggs and now won't have it. so i make raw ice cream when i can, with a lot of egg yolks in it.
i tried making her raw egg nog everyday and she wouldn't always drink it, but sometimes will.
i make popsicles with frozen blueberries and coconut milk, about equal parts, and sometimes a little honey. i've tried also doing more coconut milk than blueberries and she isn't thrilled, but will eat them.
she'll eat pb on a spoon, maybe i should make pb & CO balls or something for being out.
i have make pb cookies, just pb, sucanat, egg and vanilla. she'll eat them sometimes.
she used to love butter on everything and by itself, but now wants bread plain and refuses to eat any vegetable. she'll sometimes eat cheese and sometimes drink raw cow's milk. we're still nursing, a lot too.
i make crispy cashews, really really salty (i double the sea salt from the TF recipe). she'll eat those, sometimes, when we're out and it's all i got.
when i make some extra money, i stock up on nuts. walnuts, cashews and almonds. i want these nuts organic and really raw, so it's expensive. then i'll make cookies (yeah i know, they are cooked, but i want to cook them myself). i put equal parts walnuts and almonds (but it could be any combo or one kind of nut) in a food processor and grind until almost nut butter. I add an egg an a little sucanat that i powdered in a spice grinder, maybe a dash a vanilla. maybe salt too. i roll them out and freeze for about 15 minutes then cut out cookies and bake them. anyway, they are a high fat, good protein cookie that has less sugar than others. but they are expensive, so not for everyday.
i've tried to make coconut flour muffins with pumpkin in it, but she won't eat it. i'm all for hiding food, because i have to believe eventually she will love it on her own.
good luck!