Stella Was Schizophrenic!
1. The first few scenes showed that she could obviously act refined (somewhat like Alice Adams). However, this was ignored for much of the rest of the movie.
2. After she got pregnant, she immediately wanted to go dancing, leaving her baby at home.
3. Then, she abruptly became a self-sacrificing mother, who had no love left in her heart for men.
4. When her husband visited at Christmas, she suddenly loved him again, and tried to please him by wearing 'simple' clothes.
5. At the country club, she donned a fox fur, pearls, bangles and that giant hat to meet 'society people', and BOUNCED A BEACH BALL inside a shop when she knew how to behave herself before.
It was quite obvious that the writer didn't put much thought into what makes the character tick, and merely sought to wring melodrama from every scene. Not even Stanwyck, who was genuinely heartbreaking (the last thirty minutes painful to watch), could create a coherent character arc with the material she had.