Why was Mary Shelley life full of scandal?

Mary Godwin Shelley began a romantic relationship with a friend of her father's named Percey Shelley, who happened to be a married man. In 1814 they ran off together, first to France, and then all around Europe. On their return Shelley was pregnant, and after Percey's first wife died, he and Mary were finally married late in 1816. They were ostracised because of their scandalous behaviour. Several years later Percey drown in a boating accident, leaving Mary and one surviving child on their own. Mary spent the following decades raising her son alone and writing.