I understand what you are going through because I'm a fearful flyer myself. Many times, a person becomes fearful of flying when going through a change in their life, like a separation, unemployment, a child birth, etc etc. Maybe it would help you to write down exactly what in the flying process makes you nervous and then seek answers to that, for example, to know what is the cause of a particular noise. Cargo doors opening during a flight is such a rare event that you should be more afraid by simply walking around the house, do you know how many accidents people have at home?
If you think it could be helpful to talk to a psychologist about this, do it, as fast as possible. And on the day of the flight do two things:
- Tell the cabin crew you are afraid to fly. They are incredibly professional people and will help reassuring you everything is ok. Do it when you come in the airplane. I am so thankful to these extraordinary people who have many times dedicated so much attention to the silly crying fearful lady

- Focus on the fact that you are going to have a great time at your destination. Try to learn a bit about how airplanes work and tell your daughter during the trip, it's one way to entertain her and to reassure both of you (plus cool points for you for knowing so much

)
There's a lot of precious info on the above linked FAQ, do have a read through it, and enjoy your flight.