Is it ok not to attend the funeral

I had a friend for some time; we had differences we could not get past, so the friendship ended. Problem now is: Her mom has been a friend of mine for years; she is now 90, has been in a nursing home, and is on hospice now. She and I often talked about my relationship with her daughter, and she understood why the friendship ended; in the beginning all family members were happy I was her friend, as she didn't have many. When our friendship ended, the family members took her side, and dropped me period. Hard thing when they all live close by me. I was grateful I talked to my dear friend on Christmas, because days later the hospice began. I was very hurt when the family members no longer wanted to consider me a friend anymore. My question is this: When the time comes for her funeral, I have decided not to attend if asked; she knew I loved her, and she felt the same. I don't feel I am being disrespectful in my feelings, and just want someone else's opinion. I can hold my head up high anytime, but this time I feel like retreating. I am a widow, age 72. Thank you. Joan