Why would a married women be/get jealous of a single women? Do married women get jealous of single or newly married women?

Maybe, it just doesn't make sense in my mind, but what reasons would a married women have to get jealous of a single women? I feel like she's a lot of what single women strive to get in life (the husband, house, children, career, a huge a wedding ring, etc.). I always thought married women usually pitted or feel 'more important' than someone is single.
Why would a married women be/get jealous of a single women? Do married women get jealous of single or newly married women?
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