Webster reckons that marrow "In the larger cavities is commonly very fatty".
So, combine that with vegetable oil, mineral oil distillate, vegetable oil, vegetable oil and vegetable oil and then wash your hair the next day.
While it sounds more like sympathetic magic than a mix that is likely to do anything, I don't think it is going to do any major harm to you.
Now if the good Aunt had put some garum in there, perhaps there might be cause for complaint. Heck, she didn't even include cod liver oil - too smelly, I guess.