It sounds like you just lost a friend. There are two things you need to offer in this situation:
1. The acceptance that what we do as individuals will make very little impact. That's okay because it becomes part of a larger zeitgeist.
2. Solutions. Real solutions. Like using your position at work, whatever it is, to find carbon-free alternatives whenever you can. To select carbon-free if it is within your economic means.
What you've done is tell your friend to prepare to lose something whereas she wants to remain "normal". Both of you are wrong. We need to find something better.