did she send you friend req?!!then go to ur pending buddy list.. there are three signs under the username of the girl... one is green colored right mark which is for accepting the friend req 2nd one is cross mark which is for deleting req and next one is a round block sign to block the req.. cclick on that round sign... and she will be blocked.. then she couldn't be able to msg u...hope it helps...
Yeah she did send me friends request. Thanks for you help ria ji,I appreciate it