Found Yveen, but...

[jincyk]

I found her in a cell in the lab, but she didn't give me 6 MP--just 4--and didn't restore the party, etc. Why?

[D-Squall]

In the message said that she would restore the HP and such?

[loof123]

That means you missed her once. The 2nd time you find her she gives you only 4 MP. That means you missed her in either Tyrine or Moormore. If you missed her in Tyrine, you can't go back but if you missed her in Moormore you can go there and find her. Moormore's at the Eastern Lands of Adretana. Go to the transports, go to eastern lands and go east all the way.