Old friend annoying me?

An old friend I have nothing in common with anymore is bothering me. This is the third message she’s sent on Facebook and I been ignoring her for over a year because I feel we live different lives now and have nothing in common. I told her I’m busy at university and then she doesn’t say anything else. Wtf is her problem why does she need to know what I’m up to? Also this person never tells me anything about her own life. I know I owe her no explanation but I told her I’m busy completely my master’s degree. I almost wanted to say: can I help you? Me and her had a falling out years ago and made up but now life is different for us both. She lives in another state as well. Should I block this person?
Old friend annoying me?
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