I brought home a new 9mm VE a few weeks ago. I was not impressed with trigger either, however I have encountered far worse. I can't help with a gunsmith, other than to say that I don't see much on the internet about people having trigger jobs done on this pistol. The good news is, that I have shot mine about 150 times and dryfired it (with snap caps) about 40 times and the trigger is already MUCH smoother. Since there are no other safeties, I don't think I would lighten the trigger. Trigger travel/overtravel is a non-issue as far as I'm concerned. Before I gave a gunsmith a wad of money, I would have your sister shoot it a couple hundred times and then see what she thinks about the gun. Just my 2 cents worth...
Regards, Chappy