you might find this website useful
KK Women's and Children's Hospital - Food & Nutrition - Weaning
it's from kk hospital regarding weaning a baby onto foods.
my baby is reacts to foods that're introduced too fast. he's 8 months now but is only on carrots and broccoli mixed in porridge. when he was 6.5 months, he's only eating plain rice cereal mixed with milk. at 6.5mths he was only eat 2 round tbs of cereal. that time, he still does 5 feeds of milk a day.
milk is impt in the first yr as its their main source of protein as well as calcium. but at the same time, babies after 6 months also need to get iron from other sources. so most cereals are fortified with iron and veges like broccoli and spinach also provides the iron they need.
i think if your baby is cool eating solids, you should let her do it but do do the 4-day wait rule before introducing new foods to prevent allergic reactions. as long as she is still drinking her milk, it is ok.
the food that you're giving her is those in glass bottles that you buy from supermarket? maybe you can try making foods for her yourself? home-cooked food has zero preservatives.