I agree that is sounds like maybe she is too tired before you start the bedtime routine, or maybe your routine is too long for her at that age.

The other thing though, is that a long block of sleep during the day as well as great night sleep is very rare at that age. If she is sleeping well at night, usually you would expect shorter day sleeps and often they have more feeds during the day too. So don't be too concerned about not getting 4 hour sleeps. If she can go down easily and sleep for an hour or two, that is a good aim.

GL, it really does get easier. And it sounds like you are already doing an amazing job. Well done.