Gilly, have taken photo of Pearl's mouse. Sorry it's with my phone so quality not the best.
The mouse is made from a bubbly-textured fabric a bit like towelling. Ears are felt and the tail and eyes are leather. It did have whiskers, but I removed those to stop madam from chewing them off. In all, mouse is some three and a bit inches long and tail is four-ish inches.
Hope this is Misa's mouse too.