Theo used to do this (but was bit older then your little one). as others have said she is still very little. at that age theo was having a 180ml bottle every 3 hours. the only thing you could do that will help is when she feeds in the night make sure you feed her in practically darkness,,, this way she eventually learn the differnce between night and day, it was around 3weeks when Theo started sucking his hand when he was hungry (so we knew by that). we tried a dummy and he hated it, now im soooo glad we didnt persist with it! everntually we stopped feeding theo in the night (as he was waking up out of habbit) and just sat by his cot, gently put my hand on him and softly talked him back to sleep!
he was a nightmare sleeper, so if he can do it...there is defo hope!