(not sure if trolling or just confused but I'll play)
It wasn't clear what she was being trained for, she was practising her magic while learning the value of friendship. She becoming a princess may change the relationship within the main characters, until now there was a balance in the group: 2 pegasus, 2 earth ponies and 2 unicorns. Twilight being an alicorn changes that, especially if she acts like the others are beneath her.
no subject
It wasn't clear what she was being trained for, she was practising her magic while learning the value of friendship. She becoming a princess may change the relationship within the main characters, until now there was a balance in the group: 2 pegasus, 2 earth ponies and 2 unicorns. Twilight being an alicorn changes that, especially if she acts like the others are beneath her.
There is no prince.