Hi there. I, too, am nursing a toddler (20 months old), so it's so nice to hear from another mom like me! Good for you and for your daughter!
First of all, don't let anyone tell you to wean. There are lots of good reasons to keep nursing your daughter, as shown here:
http://breastfeeding.suite101.com/article.cfm/extended_nu...
http://breastfeeding.suite101.com/article.cfm/nutritional...
Anyone who tells you otherwise is uninformed and is only giving you their personal opinion, so no need to let that negativity influence you. :)
If she's nursing a lot like you say, she's definitely getting plenty of nutrition even if her solids diet isn't all that varied. Still, you're right to try to get her eating well for the day when she's no longer nursing.
My younget is hit or miss on eating, but here are some of our strategies:
1. hide pureed fruits and veggies in food. I never make a pancake that doesn't have pureed blueberries, sweet potatoes, or fruit in it. It's amazing how much good stuff you can hide in a pancake.
2. hide pureed veggies in meatloaf, salisbury steak, spaghetti sauce
3. offer, offer, offer. Once my older daughter hit 3, I was surprised how much more she was willing to eat.
4. incent, bribe, reward. Whatever you want to call it. Your daughter is old enough to respond to this. Lately at our house the kids will eat if we ask them a trivia question about bugs after each bite (don't ask where this came from...) Anyway, whatever your daughter is interested in-- you can make a funny face, do a dance, sing part of a song, read a page of a book, almost anything. A pain for you, but it gets the job done at our house on a bad night. Also, treat or cookie if she eats a certain amount might start to work at this age.
5. The old stand-by-- make the food a train, plane, car. Lately at our house it's the roller coaster that gets the best results, complete with high hill to start and screaming riders.
Of course none of this stuff works if the baby absoutely does not like the food. But I find once you prime the pump and they get a couple of bites in, they often start eating on their own.
BTW, don't get sucked in by marketing for that Enfamil toddler supplement stuff. It's really just a way for formula companies to expand their market-- selling formula to toddlers by preying on moms' fears that their little ones don't eat enough or well enough. The fact that you're breastfeeding takes care of her nutritional requirements.
Good luck! I think if you keep offering and try some creative strategies, you'll get her to eat more, especially once her nursing starts to taper off. (until then, she might not be eating because she's just not that hungry!).
There's a book about hiding fruit and veggie purees in regular food by Jessica Seinfeld-- Deceptively Delicious. I got a lot of recipe ideas from there.