Hi there
It looks like you are ready to move to the 4hr EASY.
In short you will increase her A time, she will (FX) then be happier to go down for a nap, go to sleep independently again and sleep for longer (a full nap), this means more time has passed before you feed her (might be 3.5hr to begin with then up to 4hr if she can manage that, some LOs don't manage to get to 4hr E just yet but that's ok).
Average A times- BOOKMARK ME! She's probably ready to go up to 2hr A time for that first A, and besides she is resisting nap so much it is already taking you up to 1hr 50 A time. I suggest you don't begin WD until 1hr 40 ish, maybe even 1hr 50, she is less likely to 'kick off' at nap time. Looks to me like she's trying to tell you she isn't ready for nap yet.
If she has a good first nap then I would also increase the second A time. If her first nap is short (say 40 mins) I would aim for around 1hr 40 to 1hr 50 A time, the idea is to reduce it a bit to take into account she is extra tired from that short nap but not to reduce so much that you are trying to put her to sleep UT (under tired). If she kicks off I suggest saying "ok looks like you are not ready to sleep, let's try later" take her out of the room and do an activity for 10-15 mins then begin WD again.
I usually say to keep the last A time before BT a bit shorter just because often they are tired by then but it looks like she would be happy to aim for a 2hr A before BT too, based on what you've said. You can judge this at the time.
This may help
Time to Transition - 3hr, 3.5hr or 4hr EASYWRT E times, the longer A and S times should help but otherwise try to track E separately for now. Aim for 3.5hr E if that is when she is hungry and eats better. There's a chance she doesn't need to eat at 2.5hr even if a nap is coming as she will sleep for up to 1.5hrs making this a 4hr interval between E, many are fine with this length between if they are asleep. That said, your are her Mummy and if you feel she needs to eat then please feed her. Just 1 min A time between feeding and sleeping will be ok to avoid a F2S prop, try not to worry too much about that at the moment.
Your routine might look something like this:
WU 7
E
A 2
S 9-10.30
E
A 2
S 12.30-2.00
E
A 2
S 4-5.30
E
A 2
E
BT 7.30
It really helps if you can record your EASY times whilst you are being supported so we can get a better idea of how things look.
hope this helps