What's the Name of That Book??? discussion

This topic is about
The Secret Order of the Gumm Street Girls
SOLVED: Children's/YA
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SOLVED. YA Fantasy - A group of girls go into a second dimension. Title may have had something to do with Bubble Gum and or a High Society? Spoilers ahead. [s]
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One weirdly specific- the dad of one of the girls (Ivy) goes to the store to get pop tarts and Mayo. Later they find out he's turned into a monster.
Other random things
-two dogs
-cover is brown and green
-Ivy takes piano lessons
-something about a slide (?)
-one girl has a lot of siblings and another one has glasses.
Please Help!