They don't hate you.
It's called grief.
My BIL killed himself with a rifle 10 years ago, on Father's Day. The screaming I heard, pulling up into the driveway will be burned into my memory forever.
My BIL's mother blamed everyone. My SIL, the psychiatrists, us, work, the neighbors, the mother was beside herself in grief. She had lost her husband to cancer the year before.
You will be angry at your friend, then sad, repeat and rinse. I've been through 6 suicides of either family or friends. You get this insane rage, then dissolve into a pile of tears.
Be gentle with yourself, and cut a huge amount of slack with the family. Suicide still has a terrible stigma. I had such a hard time talking about my BIL's death to anyone. It would get brought up, I'd say suicide, and the conversation just stopped. Like that was so gross it should never be brought up.
Go to the funeral. You can sit in the back, and I doubt anyone will notice. If you feel like the family is still angry with you/it will cause problems, just stay away from them.
If your friend was having DTs, her life was out of control. I wish for hersake, she could have called someone before she made her choice. Depression+fire arms+substance abuse/alcohol are a terrible mix.
My heart breaks for you OOM and your friend, and her family.
I'm so so sorry.....