Apart from the Eddy Quintela co-writes (which will never see the light of day) the majority of the Christine songs that are listed are simply contemporary songs that contain samples from music by Christine McVie.
e.g.
A Boy Like You (Everywhere sample)
https://www.youtube.com/watch?v=lhOiN5uk2HU
Frazier Ave (Only Over You sample)
https://www.youtube.com/watch?v=4FhEcIv29ps
The Welsh one is Songbird.
I think there's also a Welsh language version of Don't Stop listed on BMI somewhere.
I'd guess 'Body Drumming' is related to Mick's drum vest- perhaps Christine helped to programme the sounds.
The one I've been long-intrigued by is 'Automan'. I'd guess it was an unused attempt at a theme tune to the early 1980's TV programme of the same name.