Bless your heart Cornishgirl777, awful thing to experience.
I had a cousin of mine take their own life some time ago; I didn’t know him very well so I wondered what to say myself. The family wouldn’t want to dwell on what happened, and how it happened, so I would say keep it brief but meaningful and explain how you know the deceased – my family were so grateful for the support and the kindness that others showed, just by being there will mean a lot to them so I wouldn’t worry if what you want to say doesn’t come across in the right way; they will understand, they will appreciate the fact that it will be difficult for people to know what to say.
I pray that she is at peace now. I’m sorry for your loss and I hope the service goes as well as it can in those kind of circumstances.
David