Hey Cally- Lu has been doing this too. Almost exactly the same, including putting in the extra night feed.
I tried yesterday and today to resettle her when she woke up after only 45 min and she went back to sleep everytime, then she woke at her usual time for a feed. I think my issue is sleep related, rather than feed realted IYKWIM? .................. not sure if that will help your situation but you never know!