My fuddled brain can't totally remember what I did with both of mine, but I'm pretty sure they were both at least 1 before we had a more toddler routine - Jack was nearly 18 mos I think. It sounds to me like for your baby it is maybe too early - another reason to wait (particularly if she is a fussy eater) is that then the milk will be more incidental - she'll be getting most of her calories from solids during the day, which will mean you feel less pressure to make sure that last bottle is drained. Also, with some babies even a book can be too stimulating just before bedtime.
My advice would be to wait, seeing as your previous routine seemed to be working - there's no pressure to make this happen at any particular age, and it really does depend on your baaby.
hth