My aunt is a diabetic and have to take insulin with needle do she need anything from doc to travel with needles

Best bet is to contact the TSA for the most current information on what is required. https://www.tsa.gov/travel/security-screening/whatcanibring/items/insulin

I would gaurantee you would have to get some documentation from doctor and if possible have her take her shot prior to flight. I not sure how often she needs injections but best just to pack away in luggage for non issue.

Contacts TSA

You can Always Fed Ex it overnight as a precaution ahead