I have this cousin who texts me constantly and I can't deal with it what should I do?

I'm working overtime at work and I not allowed on my phone and she thinks I'm not texting her as much. She is also in her mid 40s and keeps saying don't forget about her because I'm in a relationship now why can't she be happy for me I was single for years in my 20s

I have this cousin who texts me constantly and I can't deal with it what should I do?
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