From the Super Mario Wiki
When Mario visits her house, Eve and her children are starving. If the player gives her some food for her children, she will be happy, but immediately after, she will be turned into a pig by Doopliss. Later, she is turned back to normal.
Eve also appears to have some method of obtaining Shooting Stars as when the player gives her food upon their first encounter, she will give Mario and co. a Shooting Star. Later, if the player decides to take on Eve's trouble, she will give them a Meteor Meal, which requires a Shooting Star to make. It can also be presumed that she has some in stock already.
In a trouble posted up by Eve in the Trouble Center, it is revealed that many years ago, she was in love with Podley, but issues caused them to separate. Eve is content with her life now with her children.
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