Couple questions
So either of you have any formal training besides a CCW class if you had to take one(former military don't count in that BTW, they don't teach CCW)
If not, look for a good defensive pistol/fighting pistol class to take, and take it together.
Never fire only one round, you don't want to get into that habit, pistols are already bad enough when it comes to being fight stoppers. Get used to shooting 2-3 rounds at a time. The don't have to be fast, just make sure they are quality hits, because only hits count.
*Remember slow is smooth smooth is fast.* The more you do it the more it becomes reflex basicly.
Beyond that stuff
Work on the draw, besure to use a cover garment. Don't worry about speed that will come as you get used to the motions, the more you practice it the faster you will eventualy become.
It may seem simple but run a lot of draw and fire 2 rounds.
Once thats down pretty well and yer good and comfortable with it, work on adding a side step to the draw. As in step to the left/right while drawing. This gets you used to getting off the line that the "attacker" would be taking at you also your now forcing them to react to you. It can gain you that valuable second to two that you need. Practice it to the left and the right. The last thing you want to do is just stand there. Once you get comfortable with that one step, add a second and third step. And again go slow don't worry about doing it fast, that will come
You already mentioned failure drills, practice every type of failure drill, not just the old two to the chest one to the head, becasue the head may not be a viable target at the time. As far as the head shots stuff goes at 5 yards, she should be able to do it. Perhaps yer adding strees to soon. First get her used to going for that head shot, also have her work taking that shot low to the pelvic area(I know dsopme guys will dis agreew ith that but if you don't have a head shot and two in the chest didn't stop them ya got to do something and hell it might be the only open shot to take becuase the head might not be available to shoot at.) Also try having her work on shooting smaller targets from that distance like some 3-4 inch circles. That might help too.
Practice reloads, both from slide lock and tac relaods.
Work malfunction clearance drills. Put dummy rounds in mags when you practice(load each others mags if yer together so you so you don't know when they will come up)
Something that Sully drills into us at defensive edge classes.
Fire-Self explanitory
Access- Check the "BG" make sure they are down and out of the fight and pose no threat. This helps break any tunnel vision etc.
Scan- Check yer 6 look all around you,
all 360 degrees.
Tactical reload- You don't know if that BG you just had to smoke had buddies, get a fresh mag in the gun just in case, the last thing you want to have happen is to have to shoot it out again and have a weapon that may only have 1 round left in the mag.
Again this is stuff you need to do everytime that you practice/train. Even if people give you wierd looks and shit like that(and trust me some people do
) because this is stuff you need to do automaticly if you get stuck in a shooting situation for real.
Get used to shooting from non standard and just plain wierd and unomfortable positions, you never know when the only real cover you have is going to put you in some wierd ass position that you'll have to shoot from.
Also for working on accurecy I like targets that have shapes on them, circles, triangles and squares. I also like them when working on the basics(don't forget those you can never practice them enough) And when soing things like working on my draw, or whenever working on something new.
Also practice all the drills you practice at close medium and long range. 5 yards is only 15 feet. Thats actually not a good distance and anyone with a knife/pipe will have it in you/accross yer head before you can even clear leather. My standard distances for working drills are 3/5/7/15 and 25. I skip 20 and 10 because well I just do.
Thats about all I got for ya right now. I'm sure I can come up with more but by the time I post this I'm figureing others have probably covered that stuff.
Got any questions feel free to shoot me an IM.