Hi Sally,
Could I ask why her feeding at 9:30am doesn't work well for your schedule? Is it because of the 4 hour schedule to feed? The reason I ask is because DD does the same thing and she will eat around 4-5am and then not really want much until around 9am... even if she wakes up around 8am. And when she does eat she doesn't eat that well. I have actually been thinking about doing pu/pd to get her back to sleep at the 4-5am time instead of feeding her, but I am still deciding on this since I am working on other issues at the moment.
Anyways... when DD wakes at 8ish and doesn't eat until 9ish I then just move other feeds up to get her back on schedule. I know it isn't as the book says, but it works for me... so here is sometimes how it goes...
9am eat
10am - nap
11ish - eat again
1pm - eat
1:30pm - nap
4ish - wake up and eat again
6pm - eat
7:30 eat and off to bed
Sometimes we don't do the 6pm feed and feed her around 645 and off to bed earlier - depends on if she takes a cat nap or not.
The morning thing works well because she gets lot to eat after sleeping for so long and then she has a good amount to last her for a good long nap in the afternoon.
This works for us, it might not for you, but I thought I would at least let you know how I deal with the same problem.
HTH!