After posting I started tearing my house apart. After pulling the washing machine out I returned to the living room to find her crawling across the floor! I've replaced her into the basin, which to my suprise turned out to be easier than I thought. She was very lively, I've taken this as a good sign. Shes just giving herself a good clean.
I've decided to remove the drift wood from the basin for now, I've also moved the basin off the table and on to the fire place. Could anyone hazard a guess as to how this happened? I had the drift wood with me when I came into the living room so she wasn't in there. I know I've said this already but I have no idea how this could of happened? I have not applied PTFE to the basin yet as the lid is on all time. I've taken precautions by weighting down the lid and making the seal between the basin and lid better (I didn't think it was a loose fit in the first place as there were no gaps)
I'm just pleased she is ok...
Once again any advice would be appreciated.