My 18 month old is cranky! ?

I am having some problems with my 18 month old daughter. Every morning when we get her ready for the day she freaks out! But other then that she is a angel. She goes to bed at 730 every night and wakes up at 6:00 on the dot every morning. We give her a bottle, change her diaper and she lays in bed with us till about 630. At 630 we get ourself ready while she watches tv and wakes up and the. We get her dressed. Problem is when we get her dressed she has a fit! I'm almost possitive it's because she hasn't had enough time to wake up but we give her as much time as we can. On the weekends when we Are off she lays around till about 7 and sometimes even goes back to sleep then she is a happy baby so I think she just needs more time. We have thought about putting her to bed earlier but by the time we pick her up from the baby sitters and get home we only have 2 and a half hours to spend with her befor it's bed time. Any advice on this?