As I'm sure you know, I had an SR9c. It shot great. My issues with it were well-documented on this site so I won't get into that.
My comment, based on my experiences, would be to have her try a P2000sk in LEM if I were you. You mentioned her not liking the short reset on the PPQ, nor a long double action first pull. It worked out perfectly for me, so maybe she would like it as well.
You could have her fire one of your P2000s in single-action mode as a rough approximation to find out if there was any interest. The SR9c is certainly not a bad choice either, but I know you share my love of H&K, and this could be an opportunity