From what I saw and read (I'm french) the show will focuse about the acceptance of the others even their difference. the GTS thing is because the main character Emilie was annoyed to be considered as "little girl" she will have the opportunity to travel alone during her summer vacation she will end in magical world where her bag will become alive and she will be turn into a giantess, she will suffer the problem to be accepted from the local inhabitants mainly the adults and will make friends who will teach her size doesn't matter.
Don't hope too much the sequence is brief a magical dust and poof she grows in few seconds. The whole giantess thing is to explain to kids even if you're tallest you are not different from the others and you have some responsibilities and you have to respect the others for what they are even if they are smaller than you. During the whole show the main characters will learn to grow (become mature) and responsible.
To be honest this show has no potential to be a particular interest to the process nor to any giantess communities. It's not something like Alice in wonderland or Totally Spies attack of the 50 ft Mandy. It's manly for young children it doesn't reach the teens category.
