Are there any babyfood flavors she seems to prefer? Flavors you know she likes that she may be willing to try with the new textures of more solid food recipes?
Like maybe the butternut squash? If she likes something like that, you may try roasting fresh butternut squash, by cutting it in half to bake cut side up, putting a little cinnamon and brown sugar on it, which may not even be necessary for little ones. It has a nice sweet flavor naturally. You can mash it up, or, try cutting in small soft chunks for a new texture from that of purees. There are also great soup recipes with butternut squash. An ingredient search on good recipe sites, like foodtv.com can produce some ideas you may be able to modify for milder flavor palates and such.
A list of what she likes in the pureed version may help stimulate some ideas here, too, for recipes with those flavors. She may just be resistant to the different textures or more complex palates of recipes vs. single food items. It's funny (yeah, I know you're really amused!) that the two are twins yet have such different tastes... maybe it's more evidence for the idea we each come into the world with a certain degree of personality already established!
Anyway... DK (Dorling Kindersley) put out a great cookbook called "First Meals" by Annabel Karmel, that I fell in love with when trying new foods with my son, now 4. It's a resource for recipes by age ranges, like 3-6mos, 6-9mos, 9-12mos, 12-18mos, and up till age 5. It also includes a lot of easy (and fun, I thought) to read nutritional info and food transition info between the various age stages. DK books have fabulous photo images and reader-friendly page layouts. I thought she had some really inventive ideas for new foods one might not think of offhand but that babies could respond really well to, like couscous (tiny grain sized pasta) recipes. If you look at Amazon for this, I noticed that depending on which listing you choose, some have views inside the book and others don't, so poke around to find the listing with images available. One of the pages displayed was actually about moving on to the next step after pureed foods, so you may get some tips just from browsing the book online! :)
I also noticed she has some other related books, like a baby and toddler meal planner, which I haven't seen, but may be good. Watch out for reading reviews about the UK version, where some items she used were not as recognizeable to US readers. There's a US version, so look for that one instead, unless of course, you're British!
At that age, in addition to the usual babyfoods, my son enjoyed Ezekial sprouted cinnamon raisin bread as a snack we carried around on the road instead of more refined carb foods like crackers and cereals. He did also have stuff like whole grain graham crackers, and other health food versions of baby crackers. If her issues is one with textures, maybe stuff like that could help her broaden her interests.
Eventually she'll try new flavor palates and textures, but for now, I'm sure it won't hurt anything for her to stick to single food flavors and purees till she has more interest in exploring other foods. Good luck with it, have fun with those babies!
B.