If she is waking for the day at 8.30 I wouldn't expect her to sleep until 8.30/ 9pm as that would be the 12 hour day. If you want her bedtime to be 7 then I would try waking her at 7 am.
I really wouldn't say EASY isn't working - you are getting the pattern of EASY, but she is very young and not many babies get a good EASY until much later.
If you need some help extending naps why don't you post on the naps board - you'll find some good help there.
The 6pm crankiness could just be from not getting a full feed earlier and then she's too hungry by 7pm and drinking too fast or taking in too much air.
Is the reflux being treated at all?
Laura