Sorry, but I disagree with the other posters. I do think this 
could potentially be a problem for you. These days all schools 
should have a bullying response plan that all staff are 
expected to activate should there be a whiff of bullying. This 
would include cyberbullying (texting). The communications 
between the girls may or may not meet the criteria for 
cyberbullying, but an administrator doesn't decide that until 
after conducting a comprehensive inquiry. Your handling of this 
situation in an informal manner could open you up to a failure 
to follow school district policy complaint. I agree that it 
would appear that you intervened in good faith, but the 
response from Central Admin could be to support you, but also 
may be problematic if failure to respond is considered a 
serious breach in your district. If something does come of this 
my advice would be to stay focused on your interest in 
supporting all 3 of the girls, which is why you responded in 
this informal manner. I wish you the best.  
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