An A time increase doesn't always lengthen a nap on day 1. You need to keep going for at least 3 days, often longer, and you may also need to increase again. A time for 5.5-6 months is around 2hr 30 to 3hrs, it can vary quite a lot. Keep going and see how she settles into it.
Can you do a W2S at 30 mins, look at naps option 1, shush/patting (or adapted) through the transition and into deep sleep
How do I address habitual wakings? (wake-to-sleep and other methods)This may help with the rolling, sitting etc which is going to happen at transition, then she may become uncomfortable or get stuck etc and become fully awake. These sort of developments can disturb sleep and mostly you need to ride it out. You can give as much floor time s possible in A time to help her gain the skills (so less time in bouncers, walkers, car seat, stroller etc if possible) which may help the phase pass more quickly.
You may not need to do a 5.30pm BT every day but during nap drops EBT is really useful, I was surprised how useful and how well it worked with my DS. The early mornings may be down to a bit of OT so I would have suggested an earlier BT even without the nap drop, see if the WU can come a little later. Of course that early WU can be the developmental rolling etc too, during lighter sleep and transitions in the early hours. it's great she went back to sleep until 7am!
Milk intake looks ok. If it drops more or suddenly I would cut back on the solids. Is there no DF or night feed (making 5 bottles)?
hth