Baby food is excellent if she can stand the taste and texture. I tried baby food when I was very ill and couldn't eat anything, but I just couldn't stand it, its like eating snot (or how I would imagine snot would be like to eat).
There are some baby food smoothies which are really delicious, I don't know if you get it in the US, it is called "Little Dish Baby." These are delicious because its like your drinking a sweet smoothie rather than eating a horrid sloppy mush and trying to pretend its food.
Excellent vegetables to introduce, which are easy on the digestion, and which I have always found helpful are as follows:
Sweet potato, butternut squash, celeriac, carrots, tomatoes (without skin), avocados, swede, turnip.
Your wife may also find very dark cocoa rich chocolate useful, and delicious! I find it very easy on the digestion, but it is quite high in fat and if your wife has any liver or gallbladder problems the high fat foods can cause nasty symptoms. But trial and error are her best friends I think!
Grains that are very easy on digestion are:
white rice or rice flakes, quinoa, oats.
There is a fantastic website which pulled me back from starving when I couldn't eat. Here is the link:
http://rex.nci.nih.gov/NCI_Pub_Interface/Eating_Hints/eatdiets.html
This gives fantastic ideas of foods which are easy to digest and how to build up from liquid only to solids.
Good luck xxx