I think you need to have a night routine to get her knowing the cues for sleep. Day routine isn't important with times etc. but at that age, I would say they can only manage 2 hours awake time at most in day.
Do the same thing every night. For all my babies, it was bath, milk, book, wrap, cuddle, kiss, bed. At that age, my babies were in bed at 6/6:30pm.
DD1 slept through at 4 months
DS was waking once for a feed at that age
DD2 is 6 months and slept through as a newborn, but does wake for a feed sometimes.