Hello and welcome to BW forums
It's lovely to have you here especially as you are not used to posting on forums - you'll get used to it very soon.
The only way to extend those A times really is for you to push for them to be longer and be consistent with it. From tomorrow I suggest 1hr 30 A time for all A times regardless of how longer nap is or how tired she might look - at this age they can have a habit of going to sleep after a short A time so get ready for it even if they are not really properly tired. Sleepy cues can also be misleading at this age, LO is more alert and can yawn now with 'boredom' rather than just when tired. Often changing the activity or moving to a different room/environment can help, this is also a good way to help push the A time longer and keep her distracted from sleep.
Increasing A time:
For the next 3 days then 1hr 30 A time.
On the 4th day increase again, 1hr 45. I would hold there and see how things go, post your EASY times for us to look at.
There's guidance on A times here:
Average A times- BOOKMARK ME! Extending naps and teaching LO to sleep longer than 40 mins:
During this period you can also try out a W2S, go in before the end of the sleep cycle (so at around 30 mins) and shush/pat or your usual soothing method before LO fully wakes, it can often be easier to get them back to sleep this way rather than waiting until they fully wake. Some info here:
How do I address habitual wakings? (wake-to-sleep and other methods)The 4 month regression is common and in all honestly it can be hard to see what it sleep training related and what is routine related but working towards self settling, transitioning between sleep cycles alone and establishing a suitable routine for age are all things you can do even through the regression.
With regards to the rest of the routine. I would feed every 3hrs or 3hr+. At this age many LOs move to 4hrly E so LO should really manage on the full 3hrs between if not a bit more. Rather than feeding at every wake time to produce a EASEAS routine you will check on the clock to see how long has passed since the last E time. It is totally fine to have a routine looking more like EASAEAS. She may well feed better if the E times are kept consistently at the 3hrly+ intervals. it looks like you might be feeding every 2hrs currently (I'm basing this on the info you gave 1hr 15 A time plus 40 min nap, feeding on wake up). If this is the case you will extend the E time gradually rather than all in one go, for example:
2 days 2hr 15
2 days 2hr 30
2 days 2hr 45
2 days 3hrs. I would expect this is possible within a week without causing upset to LO.
After this you might increase in 5, 10 or 15 increments and depending on nap length and if Lo can mange a longer time between. Although most move to 4hrly E during this month, some don't.
I hope this helps - it would be lovely if you come back with an update - and please do ask more questions if needed.