My husband said that I should not go…

A friend invited us for her daughter’s 15 birthday party but i had never shared any moment with her kid, because we never see each other and we lived 15 minutes away. She has never invited me to any of her kid’s birthday so I’m confused why she is inviting me now. Last year i told her I wanted to visit her and she agreed but when the time came she said she had a headache that we should do it some other time.