Hi! I'm sorry things are not getting better, but don't worry, we'll think of something...
to answer one of your questions, I don't think you're causing too much confusion with the time changings, unless Mia is a touchy baby, because in that case, she'll need a super structured and accurate routine. When my son was Mia's age i remember us doing things as the day turned, more like in time stretches than schedules.
For what i see in the feeding routine you're giving me, she's having between 32 to 34 0z of milk a day. That's quite a lot!!!! how much she weighs? is she a big baby. There are two options: either she's a big baby and she's ready for solids (there's a rule that when lo is taking 30 or more oz of milk a day is time to introduce solids to give the body the calories it needs) or she's a small baby and she's drinking that much milk because of her reflux issues. Remember that one of reflux symptoms is heartburn and the discomfort caused by heartburn is easily calmed with a few sips of water/milk. SO there's the posibility that she's drinking because of pain more than hunger, and that would explain why she's not finihsing her bottles.
At her age, an average intake per meal is 5 oz (im in Mexico and peds measure fluid intake per months, that is 4 mos 4 oz, up to 8 months, 8 oz..). Is she in 4 hour easy? she's ready for that. Is she on reflux meds? that would be also one hint to the puzzle.
I don't think pat/ shsh has an "expiring date". I still use it and my ds is 19 months old! So i'd say, use it as long as it works for you. WHen you see it's not working anymore, try something else but stick to it. The key to find results is consistency (I know it's hard to find when things are out of control).
So if Mia is needing a 7 pm bedtime, let's stick to it. I don't think the naps are a problem since she's having the proper amount of sleep recquired for her age (i remember struggling with LOTS of 45 mins naps at that age, so you're lucky on that side!). In the "... solves all your problems" book there's a 4 hour easy sample schedule. I think you might want to give that one a try, varying it from the time she's up for the day (say if she's up at 615 instead of 7am, follow the schedule with 45 mins ahead for each part).
So what we're struggling here with is her refusing to go to bed at night. And it sounds like reflux/gas/feeding related. I think we'd find answers by tweaking her feeding schedules.
Don't worry, we'll figure this out!