Retirement is hard to get used to. It sounds like she is bored, however that is no reason to intrude in your life.
Maybe you should just turn your phone off during times when you don't want to be disturbed. And maybe have a chat with your mom about the reasons you need quiet time. I'm sure if you explain it calmly she will understand and not get her feelings hurt.
I try not to bother my daughter much but I'm always glad to get a text from her. I hope you and your mother can work this out so both of you can feel good.
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Bipolar I, Depression, GAD Meds: Zoloft, Zyprexa, Ritalin
"Each morning we are born again. What we do today is what matters most." -Buddha