Amy needed help. Whatever happened, it was better than being like this, or, worse, having more changes happen.
She figured out how to turn the doorknob for her room with her new mouth, and almost as soon as she walked out, she saw her parents, who already seemed to be looking for something or someone.
Her mother said, "Amy, just go back in your room. We have a clue something happened, we'll be there to help in a minute. For the moment, it'll be best if you just wait. We'll take care of this."
Not what Amy expected, but she decided she'd made people aware and would wait.
A minute later, she heard her father calling out to her mother from their attic, "Hey, honey, one of the Books is missing. Make sure the kids are ok."
About 10 minutes later, both her parents knocked at the door to her room. "We're coming in," her mother said. They entered, and Amy looked back with her big, sad horse eyes. "We're sorry about this. Are you alright?" Amy nodded yes, and her mother said, "I'm guessing you figured out we understand about magic. We can try to do something about this." Amy just nodded again, and her parents started mumbling...well, intoning...and as they did, Amy changed. In a matter of a minute, Amy looked like Amy again, from the waist up. From the waist down, her equine pelt looked a uniform gold color now, not like a patchwork quilt with holes in it, but it was otherwise unchanged.
"This must have been done by an amateur. I couldn't get the cadence right to reverse the lower torso," her father complained.
Amy was still a little stunned at the events of the last half-hour, but found her voice. "Wow, that felt so odd. At least I have my hands and my voice back. But, um, I've got these, uh, um, things back there."
"Yes," her mother said, "I guess you have!" She giggled a bit. "Would you like us to do something about that?"
"Would you, please? They seem to have a mind of their own, and I see I'm going to have enough extra work in taking care of myself for a while."
"Well," her mother said, "we can try, but we're not sure yet how much more we can change right now."
"Yeah," her father said, "someone was playing around with one of the most sophisticated spells out there, had some really incredible power levels, but cast it like an amateur. This might be a tough one."
"Let's not scare her, she's got enough to adjust to," Amy's mother said. Then, both her parents started to intone once more, and Amy's body seemed to absorb two of her four penises...and grew another complete set of female genetalia next to the one she already had.
"Sorry, Amy, we have to work a bit more on this, I think. How does it feel?" her mother asked.
Amy thought about it for a moment. "Oddly enough, really good, but really different. But, I can't go out anywhere like this, and this body is definitely telling me it has needs. Lots and lots of needs. I'm an eight-legged centaur with two sets of both organs, and it feels like there's this constant urge. I can't go around experimenting with this, what am I supposed to do?"