Thank you for taking the time to recognize someone who went the extra mile for you.
Unless you have her name, NOTHING will happen. Sadly, CO has cut back so much on staffing they no longer have the time nor inclination to research your 'orchid letter.'

This is from a colleague who was on light duty in the Inflight office and was directed by management not to bother tracking down flight attendants who perform extraordinarily because "it's a waste of time." (THEIR words, not mine). She did it anyway because she felt it was important to boost their morale and to encourage a repeat performance.