I'd choose fabric with lots of colors, including grass green and cream. That way it won't have to match her colors exactly to blend in with her decorating.
Moda Spring House might be one option -
http://greenfairyquilts.com/catalog.php?item=2914
or Welcome to Bear Country -
http://greenfairyquilts.com/catalog.php?item=1955
or ABC 123 -
http://greenfairyquilts.com/catalog.php?item=2342