Here are some Photoplay clippings from 1937 to 1940. This first set is from 1937. I don't know why they're expanded for page width, contrary to "full-size" settings. I'll look into that later on.
Here are some clippings from 1937 and early 1938, about Joan's role in Damsel in Distress with Fred Astaire.
Here's a bit more from 1938.
Fontaine was rushed hard by RKO-Radio Pictures, and then dropped like she was hot or like...any number of pieces of drama created or fostered. In any case, they hadn't worked out how to tap into the depths beneath her self-conscious demeanor. Before moving onto Selznick International, she appeared in Gunga Din, which starred Cary Grant and Douglas Fairbanks, Jr.
In MGM's The Women, Joan Fontaine played a character much like people saw her in real life.
In 1939, Joan Fontaine married Brian Aherne and began filming her role in Rebecca. Here's an interesting story of how that movie was cast and filmed, if you're interested.
Many or most people know that Joan Fontaine had a nearly life-long feud with her sister, Olivia de Havilland. The internet is replete with tales of their disagreements, which stemmed, depending on who was asked, from early childhood, from Joan's being treated as an also-ran when she got to Hollywood, or the period in which they both achieved star stature. It's actually pretty clear they never really got along. So it's interesting to read through old movie magazines which attempted, at first, to show them on glowing terms with each other, then begin slowly to hint at the growing rift between them.
Here's the link to TCM Remembers Joan Fontaine. I can share it directly every place I have an account except this one...