She had a PA but ended it because it didn't feel right. She continued having EA, but is so focused on work and her ambitions, she let contact with OM dwindle. So it's the idea of this OM and what he MIGHT offer that is her EA, along with work. They aren't spending much time together.
I started suspecting when I snooped through cell phone records and saw evidence of dwindling contact since beginning of Dec. When I sent WAW my "boundaries" email, I confronted her with this and she said I was right, she couldn't even balance her focus on work with an EA.
As far as I'm concerned, though, it's still an EA and I'm treating it as such. WAW and OM are working a little bit together on her PhD project, so that would have to end and she would have to stop focusing on her attraction to him and start focusing on our M in order for me to be willing to change my tune.
Her work obsession is the bigger problem and she'll either figure it out through counseling or be alone. I'm not willing to have my M thrown into crisis every time she wants to advance her career. When I talked to her sis, her sis said she didn't think WAW even knew how to give priority to R or M.