Growing up, in the Caribbean we didn't wear black to funerals...that's more of a western thing to me. You see more people wearing dark colors to funerals now than when I was younger. I wouldn't wear what she has on to a funeral but I probably also wouldn't think she looks out of place tbh. It's too damn hot in the islands to wear black to a funeral.
Even here in the US it seems to vary based on religion or maybe what part of the country you're in. I grew up Catholic on the east coast. To me it's appropriate to wear black or a dark color to a funeral. But I went to a memorial service here in CA recently. The family is fundamentalist Christian. I think I was the only one wearing black. (I wear black a lot anyway). And there were no flowers. Catholics back in the day always had the casket in front (usually open) and lots of flowers sent by friends and relatives.
Her hair color looks good.