Hi there!
I would say you definitely need another bottle/BF between 11am and 4pm and 9pm. You may want to aim for 7a, 11a, 3p, 6p, DF at 10-11pm. You may also consider cluster feeding - Im not sure when her bedtime is but - do your 3pm feeding, give a 6pm feeding, then offer another feeding 30-15m before her bedtime (not making it part of her routine mind you), then do your DF at 10ish. Trying to get in as much milk as you can before you go to bed may help a lot.
Its recommended to start solid foods at 6m. This is because most often baby is lacking enzymes in the tummy to digest any except for BM or formula. Most often when we introduce solids before baby is physically ready for them, tummy upset occurs (gas, loose poo, pain/discomfort).
Formula or BM has far more calories, fat, protein - all the things baby needs to grow properly. Solids pale in comparison. I agree with Emma, that giving cereal helps baby sleep longer - if this happens I would bet it is a mere coincidence. You will want to offer as much milk as she can take, and then use solids to fill in any hunger gasps in between those milk feedings - this usually occurs at 6-8m.
At 6m, when you do start solids, it is rec to start in the AM so you can monitor her for adverse effects, and not disrupt night time sleep with tummy issues if the arise. You would usually give 1 tsp dry cereal (we used oatmeal baby cereal - rice seemed to make him too gassy) mixed with BM or formula to make a loose consistency. We did this for about a week or so before giving more. We didn't have a third "meal" til 8m because the meal filled him up, making him drink less formula and he started waking in the night for food.
Anyhow, naturally its a personal choice. These are my thoughts based on what worked for us and what is recommended. Good Luck!!
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Zoey