Jane is fuming by this point, how could her eldest trick her like this. Especially since she clearly told Amy she was afraid of becoming a mermaid, going outside to become one was her biggest fear. Jane wanted to confront Amy, to talk about her fears about being discovered. Although as soon as Jane was looking for Amy's alarm clock, a familiar stinging sensation in Jane's legs stopped her from searching.
She was just in the bath, perhaps longer than expected, plus the incident with the wet floor in the bedroom reset her curse but for some reason, Jane was experiencing the same reaction to her transformation than as if her 12 hours were up. Jane panicked as this has never happened before. Another painful sting confirmed it was becoming a reality. Even after transforming a few minutes ago, she was becoming a mermaid again, plus she was dry as a bone so there would be no way of transforming. To be sure, Jane acted fast and got to work to remove as much clothing as possible but the last painful sting was the signal she was too late. She was wearing 2 layers of pantyhose and knee high boots so it would be impossible to save the pantyhose now. Her legs were beginning to numb as Jane began to remove the boots.
Jane collapsed on Amy's bed. Her legs were just useless now and was about to start the process of becoming a tail once again. Jane removed the boots eventually but she felt the bones disappear almost instantly. A wasted attempt to remove the pantyhose only resulted in watching her feet expand and tear through one layer of fabric, then the other layer. Jane lifted her left fin as it expanded before her eyes. The rest of the transformation went on as normal and Jane could do nothing but suffer through the pain of transforming again but now her pantyhose lay in tatters hanging from her hips. Now a full mermaid again, the only thought she had was why she transformed again when she was a mermaid a short while ago. Jane needed to hurry and find a way to regain her legs again before either her baby Emily starts crying or someone else from the family comes back home. But how does Jane transform back? How long would she be like this?