Hi. It may sound odd, but the Bach Flower Remedy called "holly" may help your daughter. It helps soothe jealous feelings. Read the article on the site on Bach Flower Therapy to learn more about this form of natural healing. Also, emotional coaching can always help distressed feelings (see my book "Raise Your Kids without Raising Your Voice) for a full explanation of the technique. It consists of acknowledging feelings instead of arguing with them. When your daughter says you are being unfair, don't argue with her - just say something like, "I know it seems unfair to you. I'm sorry about that." If she says "you like them better than me" say something like "I'm sorry you feel that way. That sounds so sad." Again, don't argue or try to talk her out of the feeling. Surprisingly, this helps the bad feelings disappear, whereas the argument approach causes them to persevere. Good luck!
Sarah Chana

Did not know that Bach Flower Theraoy can do this... worth looking into.  Where do I get this?  Is it available at any health food store?