Sleeping pattern for nearly 7 week old....

[Beach Mama]

Right I know I really shouldnt complain but want to see what you all think!

Isabelles pattern of sleeping is really odd in the afternoon - and Im not sure why, here is a typical 24hour period although times vary obviously but the gap between feeds doesnt.

6pm bath feed bed
2am-3am change feed bed
730am change feed
830am nap (goes down easily - a bit of grizzle)
930am change play feed play
11am - nap (again goes down easily - grizzle, dummy if needed - asleep in 5 minutes)
12pm - change play feed
130pm - nap ( yep asleep in 5 - no worries)
230pm change play feed
330-4pm ish - will NOT sleep, cries - not jsut a grizzle but a heartwrenching cry - i dont leave her long just a few minutes at a time as there are gaps in her crying so i think she might settle.
Go in and cuddle for a bit, try to put her down, shes quiet for about 5 minutes then screaming again.

So this has been going on for about a fortnight now - Im lucky with the rest of the day/night I know - but I hate seeing her so upset....

Could it be wind building up, or is she not sleeping long enough during her other naps?? How long should she be sleeping during the day??

Any ideas suggestions would be great -BTW today it took me from 4 -5 and she finally fell asleep after I walked laps around the house with her in the pram for 20 minutes. Currently snoozing in the pram.....
TIA