WT leads JW's to believe they should not respect differing belief's, thereby forcing JWs to attempt to 'save' everyone else by attempting to convert them to become JWs as JWs are told, they would be held bloodguilty by God for not doing such.
It seems many of us when leaving the JW religion, hold a similar belief that it is our obligation to convert JWs from being JWs or at least we must inform them to TTATT. Perhaps we need to stop to consider and respect other people's right to believe as they wish to believe, JWs included.
With regard to the email received, if it had been sent from a different acquaintance that holds other religious beliefs, would you worry about what to do with her email?