Why does my friend make plans but never follow through? She said she’ll take me out for my birthday next week but never reached out (more below)?

She also invites me to some of her art events. I have gone and bought things from her before. Anyway she never really seems to do things for me like going out somewhere with me when she says she will. What should I do?

Why does my friend make plans but never follow through? She said she’ll take me out for my birthday next week but never reached out (more below)?
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