A Marriage Made on Earth — Sheila Bishop

Poor investments by her elderly father had left seventeen-year-old Pamela's future in dire straits, particularly when her godmother willed her fortune to Lord Blaise, instead of Pamela.
Even so, when the unknown Blaise arrived offering marriage, Pamela only reluctantly agreed. She didn't expect a great deal from the marriage, but it was a nasty shock when Richard always seemed to take the side of his childhood friend, Mrs Decima Strang, and to assume that Pamela's youth meant she was incapable of rational thought!
Yet despite it all, Pamela wanted her husband's approval.
The thing was, how to go about it?