Nope, but this is what I do know for a fact.
She is an enemy of Helseth, Morgiah and Barenziah.
She
was. She and they might still hold a grudge, but she has no reason to: she was an enemy of Helseth and Morgiah because she competed with them for Eadwyre's succession. Of course she resented them, what with being the natural heir until her dad remarried... But then Morgiah went to Firsthold and she managed to secure her place on the throne, so Helseth (and his mum) had nothing to do anymore in Wayrest and went back to Morrowind. This worked out well for him and everyone is happy:
1. Morgiah got what she wanted.
2. Elysana got her dad's throne and she got the foreign rivals gone.
3. Helseth became King of his whole homeland rather than of just one part of a foreign province, so it's a better deal for him.