Hello and welcome to BW
What a great job you are doing and having great success so early on too.
My advise would be to never take one day's routine at face value. Sometimes LOs crash and appear to sleep well after a certain A time then the next they don't. It's a steady routine over time that will help show where you are up to and what tweaks might be needed to help keep your LO well rested.
Looking at your first post, it seems to me (I'm making assumptions here) that after the early first nap that day, 8.50am for 45 mins waking at 9.35am the next nap was not until 12.50pm. This gives an A time of 3hrs 15 mins. If my assumption is correct then this is way too long for a 6 month old.
A time is counted from the moment your LO wakes to the moment she is asleep regardless of what time of day it is or when a nap 'should' have taken place. If she has a short nap and you are unable to resettle to extend the nap you must count the A from when she first woke, not from when you gave up on the resettle and took her out of her cot.
Have you seen this
Is my baby ready to increase his A time? (incl. 'A' times for younger babies)The guidance A time for 6 months is around 2hrs 15 to 2hrs 30.
Start counting from morning WU and try to get to at least 2hrs for that first A for a few days (you are aiming to extend that A time up to the guidance and from there observe to see the optimum A time for her). If she begins to yawn and rub eyes a change of scene might help, some gentle low key activity to keep her awake but not to upset her. We used to just stand cuddling and look out of the window.
That day you gave looks like this
WU 7.00
A 7.00 - 8.50 (1hr 50)
S 8.50 - 9.35 (45 min) tried to resettle until 11.00
A 9.35 - 12.50pm (3hr 15)
S 12.50 - ? Woke screaming
A 45 min nap can suggest UT (undertired) so although she is looking tired early on extending her A time, gently, could help to make her tired enough to extend her nap and get a more restorative sleep. An UT nap tends to last only one sleep cycle (usually 40/45 min depending on your LO) and is often difficult or impossible to extend even with an independent sleeper.
Working on the first A of the day (and first nap) is a good idea as it comes after, hopefully, a half decent night sleep. It also helps get through the rest of the day if the first nap is good.
If the first nap is short alter the days routine accordingly so the following A times don't become monster long:
WU 7.00
A 7.00-9.00
S 9.00-9.45 (try to resettle if possible)
A 9.45- 11.45
S 11.45 -
I echo Anna's advice not to worry about feeding to sleep occasionally. If she is exhausted there is just no avoiding it. Really try not to get stressed about the need to do things perfectly. Getting into a regular routine and sleep training is a process and will take some time, not everything has to be perfect all the time.
Keep a track of your EASY times so you can look back for patterns and so you can post your times for more specific help too.
Hope this helps some. Don't be hard on yourself, you've had great success already and are doing great.