Well, it wouldn't be a shard if it was the entire plane. But according to EQ1/2 Lore the Plane of Love is where Erollisi resides. It wasn't part of the Planes of Power expansion, and as far as I know players never got the chance to fight Erollisi for cash and prizes. We don't know if the Plane of Love still exists or not. The Shard of Love contained Erollisi's "body" and her oldest servants, so that doesn't bode well for the Plane of Love.