Yes. We see a photo taken in 1918 of Diana, Steve and some other allies (i.e. a photo taken on the set of the solo movie).
Also, in her first scene, Lex Luthor is recounting a Greek myth as part of his speech, including some bits about the King of the Greek Gods, and Diana doesn't necessarily roll her eyes, but it's clear from her facial expression that she knows that Lex doesn't have a clue what he is talking about. So, I guess there are allusions to her being familiar with the Greek Gods.
Not much else is revealed about Diana. She appears to be a lone wolf. She has incredible knowledge of ancient weapons / artefacts. She's independently wealthy. She's comfortable in man's world, including with technology like cars, computers, email, planes, etc, but doesn't have the sophisticated / advanced technology or know-how to crack Lex's encryption software.