Thi is an interesting question. With regard to the �3.00 per mile you have to ask did she travel the 100 miles by aeroplane using taxi service either end, did she hire a car, was it a taxi that brought her, etc. Normal Government rates of mileage are up to �0.52 per mile for 1500cc and over.
The �3.00 charged for just a hamburger was cheap, she could have charged the estate for a hotel for the night plus all meals. From your email you seem to have a problem with the executor are you also an executor or is the little green eyed monster raising its head?