Hi hon- I've just moved you over to breastfeeding as it seems more about the feeding/waking rather than routine.
We had this issue- just do what you can to wake her after eating, but don't panic about it if she misses some A time. We sould always do a nappy change AFTER the feed to wake our guy up, and this usually worked... but sometimes didn't!! Undress her as she might be too warm and cozy?