Hi George,
I sure don't want to offend, but I bought a P-22 for my daughter as a training tool (She's 12), and she hates it. It has been very unreliable and I can shoot tighter groups with my Glocks at 25 yards than I can at 7 with the Walther. I am about to swap it out. (Wanna buy it?

)
I would really suggest that she try something different. Having said all that, I would guess that a concealment holster for that particular firearm would most likely be a custom job from most makers, because it really is not a defensive firearm.
Because of the design costs (which often involves making multiple holsters until the design "evolves" into the finished product), I would guess that the cost of the laser, holster and pistol itself would outweigh the financial outlay for a better suited firearm and stock holster. I don't know if any of this helped you or not. Good luck!