My mother refuses to go to church because she thinks her portable 02 concentrator is too loud. Any ideas on how to make it quieter?

Do they have a lot of candles lit during the service? Portable O2 should not be near an open flame, you know.

Does the church have a "crying room" where parents of infants can view the service but any sounds are muffled?

Could she sit in the back pew to minimize disturbance?

Is it really as loud as she perceives it to be? It may be loud to her, up close and personal, but not as noisy a few feet away. Can you carry on a conversation with someone else when she is using the oxygen?