>>112300064The YM comics?
I don't think they're even well known enough to be considered lost media. Even most things about the show just sort of make a minor reference to them while even the comics from during the show's run that were in Disney Adventures and other Disney publications are rarely seen besides the one with her in a comic shop.
So, yeah if you can, that'd be good if only to see how much the character changed. From what I understand, her mirror image was a much bigger part of the character early on.