Don't know if this is helpful, but I'm finding with my DD that she doesn't want to eat 3 big main meals a day like she did at around 8-9months old. Since about 10-11 months old she prefers to have smaller meals interspersed with snacks. So she will have a relatively small breakfast, a small snack, a small-ish late lunch, sometimes an afternoon snack, and then depending on how much she's eaten and when she ate last in the the afternoon anything ranging from a small dinner to a whopping great big dinner.

She is also demand breastfed, so she still has up to 6 feeds (sometimes more) in 24 hours, 4 of those during the day, interspersed between eating meals and snacks. Some days she'll drink quite a lot of water, other days she'll barely have a couple of sips.

When she first started doing this I worried that she wasn't eating enough solids anymore - it really felt like she was only pecking a little at things, but when I thought about it (and the telling is often in the nappy!) she really is eating quite a lot - it's just small amounts often. I thought that she was having too much milk as she's still having as many breastfeds in the day as she did when she was 4 months old, even more at night, in fact. But I think she is just having much smaller little "thirst-quencher" BFs now.

I think it's quite common for babies to change their eating habits as they get a little bit older - especially in the transition to being toddlers - perhaps as they start using more energy, they seem to need to eat/drink more regularly to keep their blood sugar/energy levels topped up properly, and often food is not as much fun as doing more fun things like playing and toddling - if, as sitting in a high chair eating involves, there's too much sitting still for my DD she hates it!

I'm sure you're DD is getting enough - she'd let you know if she wasn't - she's just on the go now, and perhaps it's worth remember that up to 1 year old milk is still priority over solids. If you're still concerned that she's not having enough solids when she's around 12 months, then you could try offering solids before BF, such as offering breakfast before milk as kylieb has mentioned.

HTH