Just teach her to use a 2 handed rack and don't bother with the slide release.
This applies to you also. I use to carry a Glock 19 for CCW carry. I still do some times. The Glock series of pistols are pretty good the way they come from the factory. My only hang up with them has to do with the trigger that feels like one of those cheap dart guns you might have played with as a kid and the sights being off for me.
I say sights being off for me because of my grip. There is not a whole lot of weight on the bottom of the pistol and it is very easy to twist the pistol ever so slightly to the left when I fire. This throws my shots about six inches to the left at 25 feet. A simple tap over job on the sights brings my shots to the center. I did this because you need to have the same grip for every pistol, so in this case I adapted the gun to me, instead of the other way around.
As for the slide release and the mag release being small. There is a way around this..two ways really. For the slide release as pyro suggested simply rack the slide during the reload process rather than pressing the slide release. This is a better habit to get into anyways, because when the gun is dirty and you use the slide release there are times the slide will not move all the way forward. Causing you to "tap" the back of the slide forward to move the slide into its full position. By reaching up with you loading hand and pulling the slide back and letting it slam froward on it's own you are making sure the slide is in its full froward position by force.
There are a lot of websites out there that will sell you grip plugs, extended slide releases, extended mag releases..ect. You do not need these things. Male or female. My wife has a Glock 26 that is bone stock and she operates/shoots with without a problem.
When I get home I will have my wife take some pictures of what I am talking about. I will show you a pretty much a fail safe way to do a quick reload and bring the weapon quickly back into action no matter what condition to weapon is.
One question, is your G19 a new gun? If so do you have the new "drop free" mags?
Ironicly enough I happen to be carrying my Glock 19 today. Mine is pretty new. I have an older one. This one I picked up last year. It has factory night sights (which work wonderfully). I have provided pictures of what the old mags look like versus the new mags. If you have the old style mags don't worry. They are fine. They are just not drop free mags like the new ones are. However the old ones still should drop free most of the time if they are empty. The mag loaded in my Glock 19 right now is an old style mag. I have two new mags in my mag holders as back ups.
You will have to forgive the quality. I took these just now at work and edited them with paint to show the difference between the old mags and the new ones. For reference the feed ramps on the new mags are slightly bigger and sit higher up in the mag. This gives the bullets a different feed angle. However as I said before this does not matter, as the old style mags are just as reliable as the new ones.





I will take those grip photos tonight and upload them for you. It should help you over come that small slide release problem you are having. It will also help you clear a stuck mag in the mag well. Have fun with your new Glock. They are good little shooters.