Some breastfed kids need extra iron at this point, some don't. Iron in breastmilk is lower than other sources, but it is all absorbable by the body. Artificial iron sources, like fortified cereal or formula or vitamin drops, are not as absorbable (and can actually make it harder to absorb the good stuff). Iron from other foods which is naturally occuring, like meat or green or orange veggies, is in between.
A lot of people do well skipping the baby food altogether and starting their kids on appropriate "adult" foods. Cooked chopped veggies, small pieces of fruit, meat, beans, etc. It's good practice for them to explore textures with their mouths and their hands. :)
If you had or will have a 9 mo doctors visit, they will probably ask to do an iron check. If you feel she may be low in iron, the test may be a good idea.
My daughter was about 22 months when she had cows milk, and only drinks a sip or two a day. There is no age when our kids turn into baby cows and need the milk of another species. ;)