In 2009- Ciaran Gribbin (now INXS) under the name of Joe Echo had Shauna play bass for him at various live shows throughout UK and Ireland. They also did some writing together with brother John Gribbin.
Here is a review of the OXEGEN show that Shauna played bass and piano for in 2009.
http://www.bbc.co.uk/blogs/legacy/acrosstheline/2009/07/oxegen_09_joe_echo.html