You didn't seem to make much difference from the original story in this one, though I can't remember the potion mysteriously stopping to work. I guess this will be explained later on?
The only thing bothering me was the way Gretchen mother 's skin glow in a sort of silvery _meta_llic way, for example in pic 28.
Sally's regression was well made and fun. ^^ And I personnally prefer such continuous pics rather than gifs, although more expanded when there's more images and "stills" to compare, but that's just my opinion.
I can't wait to see the final bunch of regression, as this one is quite the transitional chapter. It's long awaited that some of the males finally also get kiddily ARed.
I didn't get the long scenes each time with the doll, it seem it imply a further role for it in the future (?) "She" doesn't want the kids to grow up, and will probably convince them to make further changes, I guess...
Oh, and the part with the kids playing, with Sally mind slipping a bit! It's also neat to see characters sometimes fully enjoying their second childhood.
Really a good read.