We've been doing the feed between 10-11pm although we've had a few nights where she's woken around 9.30pm and we've ended up feeding her then.
We do the bedtime feed at around 5.45pm - we've never managed to get to 7pm yet, so maybe she is waking because she's hungry. We're trying to do the 4 hour routine but feeds tend to be more like 7am, 11am, 2.30, 5.45 (then the dream feed and another at some point early hours).