Ok i have copied over the routine that was usggested to you over from the other post you did. Glad to hear you are getting the night waking under control.
7:00 wake and formula, or breast feed
7:30 solids and Activity
9:15 nap (we hope 1.5 hours )
11:00 formula or bf
11:30 solids and activity
1:00 nap (1.5-2 hours)
3:00 bf or formula
5:15-5:45 cat nap
6:30 bath etc
7:00 bottle then bedtime routine
7:30 bedtime
10:00 dream feed.
Waking after 45mins at this age can often mean she is being put down to early so isn't tired enough to sleep longer than 45mins. This sounds great have you started trying this routine yet? Have you though of trying Wake to Sleep to extend naps?