why cant she post herself ? never mind
it seems or could be against the malicious communications act - here
http://www.legislation.gov.uk/ukpga/1988/27/section/1
or s2 of the Fraud Act
which is a conduct crime
you dont have to cause loss
( but you do have to intend to cause loss )
lawyers - you know they like splitting angels on a pin point
depending on the facts - malicious communications seems more of a goer - presumably the ladys phone is not being used to send photos of cuddly puppies or kittens or kids in prams .....