Hi, if you are interested at all to reply, be aware you will be replying not to her but to the congregation. Therefore, if your reply will contain a disagreement, I am sure she will never receive the email. You can ask the congregation for her address or email, stating you prefer to know the individual who wrote to you and not just the impersonal congregation.
Jer. 29:11 is about the 70 year of Babylonian rule and when it's over. So, indeed, nothing to do with our times. You might invite her to find better scriptures to encourage you :-), not scriptures that are part of events that took place more than 2500 years ago.