Ella, well done for rescuing the little mouse. We all know you want to give her the best chance in life and you've been doing your best to try and help her. But as ValleyForge said, a baby rodent needs specialised and intensive care in order to survive and be able to be released back into the wild. For that reason, the most
responsible and
kind thing you can do for your little mouse is to let us know where in UK you are so we can put you in touch with professional rehabilitators who could care for the mouse. Any hour that goes by is crucial for her survival as they can get dehydrated very fast. So please, let us help you as soon as possible, ok? Good luck.