Please help me!!!

I would like to ask  your help.
Help me please wher and how to begin my search. Any ideas are welcome.
Sorry,  my english is not well, but I would like to find someone who was a good friend of  my father in 1937, they're studied at the Budapest College of Veterinary Surgeons. My dad is 99 years old.  Maybe the lady who we're looking for she's no longer alive, but possibly her relatives  or someone knows about her.  Please find successor, someone who can tell to my dad what happened with the lady after the World War II.
I know her last military address from y.1945