My stance on training should not be new to anyone that frequents this forum. Personally, I don't believe in luck. That's a discussion for another time. However, I do believe this woman was fortunate to be alive. There are several things wrong with this situation. Let's discuss them...
First there's this: "She grabbed her 9mm and ran outside." Anyone worth their salt will tell you this was a bad idea. Why leave a fortified location and go into an unfortified unknown?
The second, and what bothers me most is this: "The only thing I would say saved him is that my son stepped in and took him down before I could take the shot." Was she really just about to shoot him or is this just after the fact bravado? I suspect the latter.
There's a lot we don't know though. For example, based on the sketchy article, she ordered him out from behind the shed with his hands up. Then she told us she was ready to shoot him, but her son intervened. If she had shot him, she would likely now be in jail awaiting a murder sentence.
That of course assumes she could hit him, which is unlikely given her lack of experience with the gun.
I could go on, but I won't. I agree with Fastbolt:
Luck favors the prepared. Not just a cute slogan or cheesy Movie line.
This woman was not prepared for what she did. Had she had the proper training, she would have taken higher percentage steps toward protecting her household.
I'm glad it came out OK, but I fail to see how this is an example of how training is not necessary.