I know you didn't ask about bows...but a 72" longbow is very long for such a light weight bow that isn't drawn very far. It is unlikely that bow will deliver performance that will satisfy her. If you want her to really enjoy archery, I would suggest looking for something shorter.
Maddog archery has an excellent reputation on delivering a very economical bow. I hope my comment isn't taken as over bearing, but it is the first thought I had.
Now...back to the arrows.
Heritage (carbon) shafts makes some that have a wood appearance although they are carbon. You can get them in 50's, 70's, 90's, 150's, 250's, and 350's and a sponsor here (Big Jim) has an excellent price on those shafts.
For your wife's draw weight, I would suggest the 70's...but if you leave them long you might get by with the 90's.