Clues

The Menu found by christina :
http://www.facebook.com/photo.php?fbid=232729953433503&set=pu.214021851970980&type=1&theater
http://www.facebook.com/photo.php?fbid=232729953433503&set=pu.214021851970980&type=1&theater

Full Version
http://dineries.com/ca/woodlandhills/yangchow/6443topangacanyonblvd?p=1&view=zoom

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Link to coffee shop christina visited before she was taken
http://javabirdjobs.net/index.html

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Christina found a pipe which had the following url embedded on it.  
http://www.janriskibrothersplu​mbing.com it leads to this image 

Calling the number leads to a man repeating 118 233, a lulaby plays in the background, it slowly beings to go out of tune and fades away.

Lulaby Lyrics :

"The More We Get Together,"

The more we get together, together, together,
the more we get together, the happier we'll be.
'Cause your friends are my friends,
and my friends are your friends,
the more we get together the happier we'll be!

However, the original name of the tune was "Have You Ever Seen a Lassie," and the lyrics are:

Have you ever seen a lassie?
A lassie? A lassie?
Have you ever seen a lassie,
go this way and that?
Go this way, and that way,
and this way, and that way;
have you ever seen a lassie,
go this way and that?

The kidnapper made a youtube channel which led to http://www.yourfriendsarem​yfriends.com/ If you check the source code to this page, you find a rather long secret rant which may provide insight to motive. Additionally, Christina said that was her music box from childhood.