How do I get my baby to sleep a little later?

My 8 month old daughter slept right through the night from 3 months to 5 months. Then from 5 months to 7.5 months she started getting up again between 2 and 6 times a night. We eventually couldn't take it anymore and decided to "sleep-train" her using the "Sleep Sense" method in which you stay in the room for support, but let baby fall asleep on her own in the crib (no rocking, nursing, soother etc. to aid her to sleep). We've now seen awesome results, she sleeps all night and is able to usually put herself back to sleep when she wakes up EXCEPT, she's up every morning now at 4:30 am, and will cry, nonstop until I get up and nurse her. We're trying our best, but no amount of patience seems to get her to stay in bed. I am okay with an early morning... I could handle a 6am wake up, but I just can't function getting up at 4:30 to start my day.

Does anyone have any suggestions as to how to get her to sleep an hour or two longer in the morning?

Side note: she clearly could use an extra hour or two sleep two, as she has been fussier than usual since starting to get up that early.