J.,
It seems that you have gotten a lot of conflicting advice, so I thought I would throw in my 2 cents.
When I was a child, there were a lot of deaths in my family (Great Grandmother, Grandfather, Great Aunt, Father, and an Uncle before I was 10 years old). I did not go to the funeral for my Grandfather (I was about 5) but I remember the event afterwards at my Grandparents house - what I remember was that I was LEFT ALONE with my Grandparents neighbor to set up for the party and everyone else went away and then came to eat and be together. Even though I knew the neighbor very well and loved playing at her house at other times, I felt left out and alone. From then on, I went to the family funerals and recall those as great joyous/sad times of our family being together. I remember visiting with my older cousins and us talking about the funeral and the person who died - hugging each other and chasing each other in the parking lot. I know that if my first funeral experience would have been when my Father died when I was 10, it would have been VERY traumatic but since I had been to other funerals, I wasn't scared about that part - even though I was sad that my Father was gone.
Secondly, I have worked at a Hospice care facility and it seems that children who were exposed to their dying relative and included in the family grieving process really heal more quickly than those who were "protected". Children understand far more about death and accept it in ways that adults do not. Your daughter will have questions if you attend the funeral or not - it is best to be honest but not to overload her with information... let her take the lead in what she needs to know. If the Father died in a car accident - explain that and don't just say "accident".... to a 6 year old, the word "accident" means that he used the bathroom in his pants and that would really scare her to think that you can die because of going to the bathroom in your pants. Also please avoid "He was such a good man that God needed him as an Angel..." First of all, that makes children NOT want to be good and it makes them frightened of a God who "takes Father's away". Be honest and say "sometimes we don't know why people die".
It is also a part of natural development that children around the age of 6-7 start thinking about death and asking questions about parents dying or them dying, etc. Realize that this may start now given this death experience. Again, this will happen even is she doesn't attend the funeral.
The movie "My Girl" (oldie but goodie in my opinion) is a good way to get her talking or asking questions. Also look into some books that have been suggested.
Wishing you well and keeping you and the family that has lost the Father in my prayers.
blessings,
Stacy