The Princesses had opted to deal with this personally and recruited Rainbow Dash to draw Fluttershy’s attention. Celestia set about explaining how they would endeavour to make adaptations to their realm so that such a colossal mare as she could still lead something close to a normal life. Luna made it clear that, just because Fluttershy was now the size of a mountain, that didn’t mean she was a monster, just an incredibly large pony.
Their coaxing and negotiations gave Fluttershy enough confidence to reveal herself, but she still moved very slowly so anyone close by could avoid making unwanted physical contact with her giant hooves.