Hi Sienna,
Riley nursed until he was 14 months old. I did start to wean at 11 months as I was going back to work. Even though he comes to work with me, it was not going to be possible to lie down and nurse with him whenever. So I pumped for those feeds which he accepted okay after refusing all cups/bottles since he was a few weeks old. He also was a reverse cycle feeder when he got older and more interested in the world around him, so he took in a lot of his nutrition at night. I started to night wean at around 13 months, and now at 15 months he has no night feeds at all. It took a while to get there. In the end I would only nurse for one night waking, and resettle for the rest. I got strict about this as soon as he was taking about 16 ounces during the day.
What does your lo drink during the day? Are you still nursing then? Riley cannot tolerate whole milk, so he drinks calcium and vitamin D enriched rice milk. While he doesn't eat a lot quantity wise, luckily quality wise we are doing good. His fave foods are fruits and vegetables. He can also tolerate yoghurt so that gets in some extra calcium, protein etc.
Have you seen the threads for moms of picky eaters. There are also lots of ideas for foods to try in the "What did your toddler eat today?" thread.
If you are still nursing during the day and lo is getting yoghurt etc, it would seem enough. HTH a little