Would it be appropriate to help pay funeral expenses?

My father ped away on Sunday after a very short illness (2.5 weeks from diagnoses to death). He was only 55 years old. He was retired military but opted to not have veteran benefits upon death. There is no life insurance and very little liquid ets. My mother is having a very modest memorial and he was cremated. He will have a full military honors at graveside and a flag. So fair my mother has paid $1120 for a direct cremation and death certificates, $1400 for a double head stone, $40 for plot, $60 for obituary. He will have some medical bills but will not be outrageous. What is typically considered appropriate regarding finances? Would it be appropriate to help pay for the funeral? My mother is only 50 years old and is a full-time teacher for middle and high school grades. She does not ask for help and is a very strong and proud woman. My husband and myself are doing good financially and are in a position to help. Would it be considered an insult to help her out with this? What would be considered appropriate?