Ask your wife what is most important to her in getting back into the sport, what will make her feel safer and strong enough to get back out there. Then you can find out what kites would best suit her and start looking.
For me the changes from C's to bows/hybrids boosted my confidence no end.
If she wants to talk to other female kiters about any concerns etc get her to PM me.
Hope all goes well and we see her on the water soon.