What happened to change Ruth's beauty as at when described as a pretty girl changing into a settled woman is that the stress of living in poverty has changed her natural beauty into a more older and weary look.
According to the complete text, A raisin in the sun, Walter, Ruth's husband, they lived in poverty due of the cramped space and worn furniture due to old age, a very tiny space in and around the house, not being able to pay off debt and feed.
They lived a life of poverty and it had a great effect on her beauty as against her promising beauty as a young pretty lady.
This happened for a while and had to:
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