Hi and welcome
My best advice would be just not to overthink it. Sounds like you are doing great! If she wakes a bit early and isn't hungry immediately, wait a few minutes and feed when she is. AEAS isn't a problem
Her A time starts when she wakes up so count from then so you know when next nap should be, and get a feed in before the nap is due. If that means at parts of the day she goes a little longer between feeds than 3h, and at other times shorter, it's ok.
Just as an example
WU 7 and E
E and S both due at 1pm....so feed a bit early, say 12.30/45 depending on how quick she feeds
E 3/when she wakes (so slightly longer than 3h feed cycle).....and you are back on the EAS track
Hope that helps x