I don't know if I'll be much help but...
The rec age for solid foods is 6 months, there are a million reasons why that is and there are also tons of pedi docs that rec solid foods earlier. That said... Owen with reflux started solids early. Formula or BM should be the main source of nourishment in LO's ages birth to 1 year. At 5 months, solids are merely for taste and fun, and experimentation. They should in no way take the place of, or get it the way of formula or BM consumption. Also, the solids should be in addition to what she is getting for BM or formula. The calories, fat, vitamins, and protein in pears or any fruit or veg PALES in comparison to what is in formula or BM.
My example is this...
A while back - I, on the advice of my pedi cut my son's formula intake back from 40oz a day to 30oz a day and added solids. Well suddenly my son who we had done so much sleep training with to get him to sleep through the night started waking in the early hours of the morning. I couldn't figure out what was going on - but my friend Stacy knew what the trouble was - My dude was starving. Well, we fixed it by taking away the supper 'meal' and giving him 8oz at the 7pm bottle and DF bottle. He stopped waking up in the early AM.
My advice is, give her all the formula she wants per feeding. If she is sucking a bottle dry, she may need more - try more in the next one and get an idea of how much she wants. If you want to do the solids, give her an ounce of pears 30 mins after she had her bottle in the AM. That way, you will be less likely to have her too full for the next bottle cause she has 3h and 30m to digest the pears.
Owen did rice cereal (you can try baby oatmeal and or barley too) pears, apples, sweet potato, avocado, banana to start with. Go slow, give the new foods at least 3-4 days before giving a new one. Don't let it get in the way of her bottles and give her as much formula as she wants to take at feedings (if she has had a growth spurt she may need more then she had before), and I bet her night wakings will stop. Also, about your routine - 630am may be her internal wake up time and you may wanna move everything up to that time if she always wakes then, that may make your routine go smoother. But if its recent, it may just be that she is hungry.
Squash, I cut up into small pieces and put it in a microwave safe dish with a bit of water, put plastic wrap on it and let it steam for about 4-5 mins til soft and then pt it through the food mill.
I hope this helps some.
Zoe