She got the proof that her daughter was OK when the young woman that was in the room with her suddenly screamed. Marge got up, and saw that her belly had suddenly got really huge, as if she was pregnant. Marge realized that it wasn't just an impression, and that the young woman really was pregnant, and with her own daughter, no less ! She screamed as well, unable to grasp the situation completely just yet. Dr. Hibbert, alerted by the women's screams, came in the room and said :

"Ladies, please, just calm down ! What is going on here ?"

Marge took some time to catch her breath, then explained everything to him, including Lisa's first regression into a five year-old, as well as her earlier transformation into an elderly. Dr. Hibbert, with a surprisingly serious look on his face, said :

"I have seen some weird things as a doctor, but this is the weirdest by far. I'm afraid I am as puzzled as you two are.
-But, what shall we do ? Is my daughter OK ?
-For now, I think the best solution is to wait until Miss... Um...
-Fairground. Melissa Fairground.
-Thank you. To wait until Miss Fairground gives birth to your daughter again. In the meantime, I'll search through my medical books to see what disease caused her transformations."

As soon as she heard those words, Melissa's eyes widened, as if she has just realized something.

"Wait, I think I remember something ! Mrs... Umm...
-Simpson, I'm Marge Simpson.
-Thank you. Mrs. Marge. My older brother is a doctor too, and I remember him telling me about a disease like your daughter's ! I don't remember the details or its name, but he should be able to tell you and find a cure !
-Really ?! Thank you so much, Melissa !"

Marge was really happy. Lisa was OK, and there was a way to cure her from her disease. Dr. Hibbert also looked relieved, though a bit surprised to realize that even he could still learn from younger doctors.

"Well, I'm going to fetch Dr. Fairground. Do you wish to come with me, Marge ?"