Did motherhood change her?

My older sister has always skated through life and did whatever she wanted. To the point you could tell she didn’t care about herself or life. But now that she is a mother. She’s the best version of herself. When I asked her what’s changed? She said she must give a f$,&@ now she has a kid.
I can’t help but be upset with her. Does this mean she never cared about anyone or anything before? Even her Family?
Did motherhood change her?
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