Generally, it may be that someone in the family has been ill, something bad happened, or had a bad dream. Then the older generation taught her to pray to God. It is difficult to explain in Mandarin, but press This process should be called "Replacement", which is to drive out the bad things and let others replace them. People next to you cannot see the bad things in your home. It is best to stay in your own room
This It's superstitious and similar to Taoist priests' practices that have no scientific basis.
But she does this for the benefit of her own family. Anyway, it doesn't hinder you. Just follow her wishes in everything. Let her seek peace of mind