Exploding targets - here's a link to some I've used in the past (bought them at a local gun show for ~ $1 each): [url]http://www.arrowanaproducts.com/target.htm[/url] They are pretty tough to hit and explode (don't think I've ever been able to set one off myself, but the people I take out shooting with me always hit 'em fine - grrr!) Great attention-getter at the range, however!
I'll second the bowling pin shooting idea. My wife and I have been shooting weekly at a local club, and it's been a lot of fun. The group at the shoots is great - when we were starting off, we would hold the whole match up while reloading magazines, missing pins, etc., but we got support instead of sighs and hassling.
You mentioned that she was OK with revolvers. My wife has shown a big interest in Cowboy Action shooting. It would require the purchase of some more guns (never a problem!) and (unfortunately) some clothes, but the bottom line is that it's still a shooting activity. We've been to a shoot once (as observers), and had numerous competitors come up to us and ask if we had any questions, and invite us out to shoot. It seemed like a really friendly bunch. The shooting itself doesn't appear too demanding. I've even heard and read that participants will gladly let you borrow guns until you get your own. As I mentioned, the dressing up part doesn't really interest me, but it sounds like at some of the big matches, the costuming becomes almost as important as the shooting (they have pagents and costume competitions, etc.). At any rate, might be a less "threatening" competitive shooting sport to check out than IDPA/IPSC. Certainly not as practical, but will still involve shooting, and emphasize gun-handling skills and safety.
I think the big thing here is not to try to force her into it (that never seems to work with women). My wife started off a bit more interested than it sounds like yours is, but as shes found things she likes (picking out her own guns, cowboy action shooting, pin shooting, etc.) she's really gotten excited about it.
I don't know anything about your current situation, but perhaps part of her reluctance to become involved more deeply in firearms is the potential for having to use one in self-defense against her ex (or others). If this is the case, getting her involved in other "non-threatening/non-combative" shooting areas might help.