Hi, welcome to RootsChat
I have two Mary Maslens, which I don't think are yours, but here are the details anyway because you never know.
Mary Maslen b c1716 @ Stanton St Bernard, f. John Maslen (Maslyn), m. Esther (nee Smith).
Siblings: Ann b.1704, John b. 1705, Ann b. 1709, William b. 1710, Elizabeth b. 1715. All born Stanton St Bernard.
Mary Maslen b. 1742 @ Stanton St Bernard, f. William Maslen (sister of Mary above), m. Ann (nee Pyle).
Siblings: Elizabeth b. 1740, William b. 1746, Anna b.1748, Robert b. 1751, John b. 1754, Thomas b. 1757. All born Stanton St Bernard.
Like I said, I don't think they help but you never know.
Cheers
Bob