Hi, mlmcholm,
The replies already posted suggest that Maria Bland born ca 1866/7 was born in Preston. As all Maria's children were raised as Catholics it is possible that she was a Catholic.
The fact that she and her possible parents were married in Anglican churches is not an argument against her being a Catholic. At this time the Catholic church accepted that marriages in Anglican churches were sacramentally valid.
As her children were raised a Catholics, it is very likely that they were all baptised as Catholics. There were seven Catholic churches in Preston at that time and, as far as I know, none of the baptismal registers are available on-line, or even as hard copy. The early registers will have been deposited in Lancashire Archives in Preston.
The Catholic churches in approx order of closeness to St Peter's, are St Walburge, St Mary, St Ignatius, English Martyrs, St Wilfrid, and St Joseph.
Hope this helps