So sorry for your loss.
I had an entire congregation boycott my mom's funeral, though she believed until her last breath that it was the Truth [she was inactive for many years]. They mostly did it to punish me for daring to leave the cult. I am glad she could not see it - for she really thought God was with these people from the time she 'got the Truth' in 1960 till her recent death.
What a horrible lack of Christianity these people practice. Your love and attention to her is a tribute to her and to you. Peace and hope to you in this trying time.
Jeff