Boiled or roast beef, ground buffalo, ground turkey. Wellness no grain canned food or EVO canned. Warm it up in the microwave a tad. If she would eat 2 cans of EVO a day with the cookies she'd probably be ok. Honest Kitchen (some stores have the $3 box samples)
Hawaiian sweet rolls, lorna doone cookies, all beef hot dogs, tuna in oil mixed with kibble. Can you go to the food store & get samples? Usually Saturdays are good for samples at Petco (not sure about the others). Offer her something different every time
I have also had to boil chicken or turkey, then fry it in butter and hand feed. Peanut butter, ritz crackers
How long do you have her?