The appropriate way to let her know about the delayed e-mail is " I regret to inform you that we will be unable to deliver the report as scheduled"
The client is should be always satisfied base on the official service you are rendering to him/her.
In a situation whereby the scheduled time to deliver a project isn't convenient you have to relate the information/e-mail in a professional manner.
Therefore, the appropriate way to relate a message/e-mail to the client is I regret to inform you that we will be unable to deliver the report as scheduled
learn more on appropriate e-mail delivery here: brainly.com/question/13720138
#SPJ2