Mary, entranced by her transformation and wanting to try out some more, decides that she needs to make sure she can be fully human again. She searches and finds the female human vial and takes a sip of it. Her half-cow body slims down a little, becoming a little less cow and a little more human. Mary takes another sip and watches her body revert a little more to human.
Taking a swig, and swallowing almost half the bottle, Mary finally reverts to her old human female self. Her tail grows shorter and is pulled into her. Her udder softens and fades into her belly. Checking her whole body, Mary is relieved to find her completely cow-less.
Sitting down on her bed, Mary idly swishes the bottle of human female around. She is already female, what would the rest do to her? Would it do anything?
With a shrug Mary ups the bottle and drinks the rest the potion.