Are you cluster feeding through the afternoon? Sounds like she's doing her own natural cluster feeds, but when you'd like her to be sleeping...
She could be switching day and night, or just shifting her night to 12-12 rather than 7-7. Are you taking her outside in her first A time of the day? That can often help. Its hard to say push A time because she's so young, so really its just about making sure she doesn't sleep more than 2hr at a time during the day and getting those cluster feeds in a little earlier. She may be hungry at that point as late in the day, supply often drops quite naturally - you may be able to try resting as much as you can in the afternoon and drinking plenty of water to keep your supply up in the later part of the day.