Glad you made it out "OK" and you kept a cool head, and I'm very glad you have a place like DC to share lives most challenging moments'.
It's hard to think during those panic situation, and over all you did a great job.
As others have said; if this kind of thing should ever happen again, arrange to have her head to a public place you both know, or if there is a Police station in the area then head there. Then have her call 911 and report what's going on.
Most of the time, the 911 operator will instruct her to keep moving, and have unites intercept her.
About a month ago some LEO's where able to do that in Florida. Sorry could not find a link to it.
Having your CCL does not make you an LEO, and even a seasoned officer calls for backup when faced with a situation.
And while you did a great job of not panicking, and keeping your cool, which saved your lives, the BG's may have been caught if you or your wife had called the LEO's sooner. Also, please tell you wife she did a great job of trusting that little voice. In my experience it's never wrong. And finally, you may want to consider doing what I do. I have my wife's and my cell phone GPS enabled, so LEO's can find our location if needed.