There's no rush to introduce solid foods, and the fact that dd is continuing to take her pre-solid foods quantity of milk is brilliant, just what she needs!
Baby milk (breast or formula) is the most essential part of a baby's diet until a year old, and yes, the quantity does decrease as she eats more solid food, but you don't want it to until at least 9 months! For now try to think of solid food as a top up (for hunger and for nutrients), rather than the main part of her diet, the risk with introducing extra meals or larger portions is that milk intake decreases too soon!
Other than that, it sounds like dd is doing really well, and introducing new things the way you are is spot on. You could try introducing another meal, but don't be afraid to withdraw it, or reduce the quantity offered, if her milk intake decreases at all.
HTH?
Ax