So sorry you have a sick baby. Pancreatitis is definitely nothing to mess with. I am glad that she is being kept on IVs. I have had different pups over the years hospitalized with pancreatitis and never really knew the cause since they don't have varied diets and definitely no scraps from the table. I am quite sure the hot dogs probably caused this because they really are a trigger for pancreatitis.
As for giving meds, I either use some of the canned food to hide the pill in (like a tiny meatball) or a small piece of a sweet potato. They are pretty sharp...if it is a pup who hates to take pills, I put it in their bowl of food so they don't realize there is something different. I always have sweet potato chunks on hand for treats. I learned that from a vet nutritionist when I consulted with her for a diet for one of my pups with lymphangectasia. If you don't mind home cooking it is a great way to go...but definitely only under the direction of a board certified vet nutritionist. You can go to petdiets.com or balanceit.com Balance it has free diets for healthy pups, but will require your vet's clearance if the pup has an illness. As for commercial foods, Royal Canin, Hill's and Purina all have RX foods that are low fat. One of my pups is on Purina EN .. they put him on it after a bout of pancreatitis that landed him in ICU.
I hope Annabelle is better soon and back home with you!