Lisa cannot be retrieved unless she's utilising a storable building/deco.
Can you see her in the townhall census? Or is she off the map all together?
EA has to go into your game and get her back.
This Forum is provided by EA but is designed as Player helping/advising other Players. In this case there is little other players can do for you.
Contact EA directly
http://help.ea.com/en/contact-us/new/ and ask for a gameadvisor. Same login as the game.
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+++ This Forum is provided by EA but it is designed as Player helping/advising other Players - meaning we are not employed by EA +++
D'oh! - Em