Is my daughter's bad attitude and misbehavior because of the new baby?

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Ok, "the new baby" is now 14 months, but my 6 year old daughter continues to have a Rotten attitude and misbehaves at home. I at first thought it was a phase she was going through because of her new baby brother. It has been over a year now and she still seems to have issues. There are times when I just flat out ask her what her problem is. (Her attitude can be so rotten!) She usually squenches (sp.?) her face up and stomps out of the room shouting "Leave Me Alone"! Then, there are times when she will tell me that I spend a lot more time with her new brother than with her. I've tried explaining the fact that babies require a lot of time and attention, but she still seems to think it's not fair. I also work (part time) in the evenings, so I don't get to see her as much as I would like to. I spend all day with my 14 month old and I go to work about an hour after my daughter gets home from school. She's in bed, asleep, by the time I get home at night. Any ideas on what I can do to help the situation? Any advice would be deeply appreciated. I love my daughter and would like to have her loving and caring attitude towards life back.