The L Arise is close, but it's a bit too almondy warm. The Éclat Dupe has more lime and is woodier and sharper... considering all the softness that Sensi has. A mix of both 'Dupes' would probably be ideal, but it's still not THE Sensi.
I'm still grieving too. Has your girlfriend found a replacement? Unfortunately, I haven't... It's a one-of-a-kind scent. If I could wish for one discontinued fragrance to come back, I wouldn't have to think twice - it would be this one.