Sister In Laws Funeral. I need some advise please! Serious Answers only?

My Sister in law. My husbands brothers wife. Was killed in a car accident last Friday. I feel heart sick for him. My problem is I barely knew her. They have only been married 2 1/2 years. And they have always lived in Florida. My brother in law is in the Navy, and that is where he is stationed. I only saw her about... show more My Sister in law. My husbands brothers wife. Was killed in a car accident last Friday. I feel heart sick for him. My problem is I barely knew her. They have only been married 2 1/2 years. And they have always lived in Florida. My brother in law is in the Navy, and that is where he is stationed. I only saw her about 5 times. At their wedding, 2 Thanks Givings and 2 Christmas's. He is bringing her back to California for her funeral, as this is where her family lives. My problem is. When I was on the phone with him last night he asked me if I would speak at her funeral. With out even thinking I said yes if that is what you would like. After we hung up I realized I really don't know what to say. Beings that the times I did see her were big family events, we never really had a chance to have any one on one conversations. Should I tell my brother in law that I have changed my mind. Or does any one have any suggestions.
Thanks ahead of time.
Update: I already talked to my Mother in law and Husband and they didn't know her any better than I did. She was not good at keeping in touch, writting letters or returning phone calls.
Update 2: Do you think a nice poem would be Okay?
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