If you two don't plan on exploring the wonderful world of endgame, WHM/SMN will be passable as a support job. Just keep in mind that if you ever do plan to foray beyond into any sort of endgame event, Danielle will get quite a bit of flack without having SCH leveled as a support job.

The Final Fantasy XI community is very demanding when it comes to support jobs. Exploring alternate support jobs, while fun, is usually not permissible. It's an attitude some find off-putting. My personal approach to it is that it's acceptable to experiment with support jobs as long as everyone you're partying with don't mind (a rare occurrence). As such, I usually leave experimenting to solo play.

Some might argue, "I don't pay $12.95 a month to have people tell me how to play the game!" Others argue, "I don't pay $12.95 a month to have other people waste my time with sub-optimal job combination." I, personally, tend to fall into the latter category. I encourage experimentation, but not at the expense of others' time.

At any rate, my point is that while SMN is certainly a good choice for a sub, it's not the best, and she'll probably, at some point, get flack for it.

As far as potential support jobs for WAR go. At early levels you'll get by with /MNK. I don't see that very much at high levels unless people are feeling particularly nostalgic. /THF has its place, although that's fairly rare as well. These days, it's /NIN if you expect to be pulling hate and taking a few hits or /SAM if you just want raw damage potential.