OP, I'm sorry your wife was fired...it's enough to depress someone when this happens. It's good that she is talking. Listen, listen and listen to what she's saying. Validate whenever you can, but do not try to fix her situation. She has to do this for herself. Her depression has deepened a bit and she's bouncing back and forth towards the darker, deeper depression. I know that you'll be there for her and will help her if she should ask.
It's good that you are going out on a "first date". This may help her. Being friends on Sunday will be good as well. Keep yourself on the no expectations trail for now.
The most important thing....take care of yourself!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.