Hi Pandabean. To be honest, I would not extend the feed times longer than 4 hours apart if you can, purely because babies have tiny tummies and obviously need feeding regularly. Some babies WILL go more than 4 hours, but this is more at the age of around 9/10 months.
Obviously the reason your DD as you said, is decreasing the bottles due to solids. This is normal, and not usually a cause for concern, but obviously you want to ensure that she is getting more milk than solids, does she eat big meals of solids, as this may be the reason she can manage longer and not fit the milk in?
Now, in terms of EASY, it is obviously not a schedule, but a routine in which things are done in the same order each day. Sometimes it is not possible to always get EASY, especially is your lo is going a little further between feeds. You would then get something lik EASYA IYKWIM? I would forget the idea of trying to have a set EASY every day at set times, and just make sure you get the Eat and sleep right, as they will affect the amount of activity time she has.
I hope that makes some sense to you, just work with your babe as closely to the EASY pattern as you can and you will be fine. My lo is older than yours and my EASY which is quite a loose EASY goes like this
E 8am
A
S 10am
Y
E 12pm
A
S 2:00pm
Y
A 3:30pm
E 4pm
A
S None till bed
E 7pm
A none (windown)
S 7:15
She can only handle the long A time in the afternoon, not in the morn, and this works for for her. It is still EASY, but adapted to suit.
HTH a little