Instead, Glinda reveals that she's only reminded the Wicked Witch about the slippers so she can involve Dorothy in a game of monkey in the middle -- teleporting the bereaved Witch's rightful heirloom off her dead sister's feet and onto Dorothy's.
Imagine the audacity it takes to steal anything off a dead person, especially while the body is still warm. And Glinda doesn't just steal her shoes, she somehow magics the WWotE's feet so that they curl into those curly party horns you blew at birthday parties when you were a kid. Nevermind that those feet were the only means the munchkins had of dragging a witch corpse out from under the house so they wouldn't have to smell her decomposing body for forever. Glinda just doesn't give a fuck.
So, Glinda steals the shoes, THEN, she straight sells Dorothy out by telling the Witch that the shoes are now superglued to the girl. Dorothy just stands there like a chump while Glinda whispers that the slippers must be super magic or the Wicked Witch wouldn't want them.
What?! This is like Gandalf stealing the One Ring from Sauron's brother, giving it to Frodo, and then saying "You should hold on to that shit. He totally wouldn't want it if it wasn't powerful."
And to top off everything else she's done, Glinda then mocks the Wicked Witch, laughing at the fact that she apparently has no power in Munchkinland, before telling her to get lost. By this point, the Witch is good and pissed, and Glinda has ensured that she's completely focused all of her well deserved rage on Dorothy. As the scene ends, the rivalry between the Wicked Witch and Dorothy has been set, even though they should both be pissed at Glinda's perky ass.
It's like Tony Soprano's mother decided to use her powers of passive-aggressive manipulation to take over the Care Bears cloud city: Nobody is even half evil enough to understand what she's doing to them. Which is why Dorothy has no ideas that she's about to be turned into a low rent hit man ...
So, the orphan girl from Kansas now has Oz's Saruman/Hitler mashup gunning for her, all because the 'Good Witch' got her involved in some kind of grander witch struggle without her consent. Glinda then goes on to explain that Dorothy has made "rather a bad enemy of the Witch." Not really, Glinda made her rather a bad enemy of the Witch. Dorothy stood around like a confused kid -- because she was, you know, a confused kid - while Glinda essentially framed her. So, despite being an innocent third party to the whole thing, Dorothy has just become Oz's version of Neo, only Morpheus is just some dick with his own agenda.
"Have you ever had a dream, Dorothy, that you were so sure was real?"
Once Glinda sets Dorothy up to be the object of the Wicked Witch's rage, she sends her off to find the Wizard, telling her that A) she would be better off getting the hell out of Oz altogether and B) she can only achieve this by going to the Wizard, which means leaving Munchkinland, where, coincidentally, the Wicked Witch has no power. The Wizard, Dorothy is told, is the only one who can help her.
Help you do whatnow?
Unfortunately, that was bald faced lie.
Anyone familiar with the story knows that at the end of the movie, Glinda tells Dorothy to click her heels to go home. Boom. Heel clicks, home. That's it. No wizard necessary. This whole elaborate journey Dorothy is about to embark on is predicated on a whopper. But, more on this in a bit.