Waking up early but still tired

Hello all, Summer is 11 months. After 5 days i think i have successfully cracked this controlled crying lark. She is going to be at around 7.30/8pm and last night for first time i didn't have to go in her room at all. She did wimper but only for a few secs. Anyway, the last couple of days she has been waking up at 5am screaming. I try the control crying but she's awake and refuses to play ball. She can't settle herself back to sleep. I go in to her (after leaving her as long as possible) and pick her and put her in bed with me and she will then wake up at 7am. If she wasn't still tired i would get up (although i really don't want to get up at 5am as work full time) but she cries because she's still tired and like i said she falls straight asleep when she's in with me.

Any ideas how i can keep her in her own bed asleep? Since i've started the controlled crying she very rarely now wakes up happy. She use to wake up and play with her toys but now just stands up crying until i go into her.

Any suggestions would be greatly appriecated!!