Without sounding too much like a b*** here goes. I have a lot of milk at night because of the big gaps in nursing/pumping. My 9 mo old drinks a "lot" i think at night before bed, and once around 4 am then again when she's up at 7 am. I think it's important to feed your baby plenty at night IF they don't seem to be eating much milk in the day.
My nanny says she's only drinking about 2-3 bottles of 5 oz of BM in the day so I make sure she gets plenty of milk at night. She does eat plenty of solids.
Unless you're really dying without the sleep at night I would continue feeding the baby at night at least once if she seems to want/need it. It won't last forever. Eventually she'll STTN and won't "need" milk at night. It's such a short period in their lives that they are babies and that you are waking with them at night.
Good luck! I'm not going to get into a discussion about the ferber method but I do not think this method works for everyone. Be open to going with your instincts and not relying on a book for advice.