Everyone has each other's cell numbers for reasons related to the nature of the work we do. Rather than reply to my email from her email, she responded via a text message from her daughter's ipad, so I randomly got a text message from a number not in my contacts regarding a work email I sent to my coworker. She was not trying to be funny or cute or anything. She genuinely thought this made perfect sense and was not out of the ordinary at all. We are not friends. She is 50.