Answer:
She participates in religious customs in an unconventional way.
Step-by-step explanation:
The first stanza of "Some Keep the Sabbath Going to Church" goes thus:
Some keep the Sabbath going to Church –
I keep it, staying at Home –
With a Bobolink for a Chorister –
And an Orchard, for a Dome –
We can immediately see that the speaker says that some people keep the Sabbath day by going to church, but she does the opposite, by staying at home and instead of singing in the choir or listening to the choir, she uses a bobolink and her orchard represents the dome of a church.
These details suggest that the speaker participates in religious customs in an unconventional way