Hi Lorilee!
I think the answer to your question, if I'm understanding the context correctly, is that solids replace breastmilk as your baby gets older. I would probably start offering solids before nursing and see where she goes with it from there. Jeremiah is almost 14 months old, and he *must* nurse in the morning. He'll eat breakfast first sometimes, but he's always still "hungry" for mama. We don't really have a set schedule, but I offer solids every 2-3 hours, and nurse whenever he wants to. Lately he's been asking to nurse when specifically when he's sleepy. I'd say that he's nursing 4-6 times during the day and 1-3 times at night.
He has a huge appetite, and frequently is very urgent about nursing when he can't possibly be hungry. I suspect that developmentally he's in a place where nursing has more to do with comfort than with nutrition.
Whole milk (which can be introduced at this age) can be a convenient source of nutrients, but is not required as long as she's still nursing 3-4 times a day. Jeremiah gets about 4oz of whole milk over the course of the day (either cow or goat), and he really likes soymilk too. There are times when I just don't want to nurse Jeremiah at all and I give him a cup of milk instead, but this is the exception rather than the rule. I like having the option of giving him non-mommy milk occasionally, but I wouldn't say that I'm trying to wean him (others may rightfully disagree, but this is all my own perspective. ;)) I'm just trying to take a balanced approach.
Have you visited www.kellymom.com? It's my favorite resource for nursing questions. ^_^
Good luck! ^_^