The Prophet SAW had that ability to forgive people for insulting him or his mosque, at his discretion. But he is not here now in this world so we cannot make that discretion. Did you know that Islamic shariah prescribes death to anyone who insults his honour?
How did this girl dishonour the prophet? She violated mosque rules , a rule which applies to all mosques. But that is about it. Nothing more nothing less. Plus she was there to begin with for spiritual journey.
Also, Porphet Mohamed pbuh was not vindictive and never sought revenge against people who insulted him personally. When the companions got upset and rightfully reacted to such indicents, most often he discouraged that.
The Quran itself teaches to forgive people who do wrong to you. You folks love to go extreme and think about punishments only.
THIS GIRL IS YOUNG AND GOOD MUSLIMAH BY VIRTUE OF HER TRAVELING TO THE MOSQUE TO BEGIN WITH.
Better than many who could but enver paid a visit to the prophet's mosque. She deserves credit for her good intentions and a lesson of Mosque behaviour. There is no crisis here.