Yep! EU should definitely be canon.... The legacy of the force was an amazing book series!
Star Wars Day 26: Mara Jade by Meeps-Chan.deviantart.com on @DeviantArt
Mara Jade Skywalker - 2016 by mistermat05.deviantart.com on @DeviantArt
Mara Jade by ~nbashowtimeonnbc on deviantART
Jedi Master Mara Jade.
Another really cool Mara Jade illustration, this is great inspiration for a kind of "black ops" character with Jedi/Sith training
La Asesina del Emperador, la madre de Ben... Mara Jade Skywalker
Mara Jade costume reference
Mara Jade eventually abandoned the Empire to marry Luke Skywalker. Together, they foster Daphne's daughter Kee Skywalker.
Mara Jade - Swarm War