Woman Buys $2 Record At Thrift Store — Then The Cashier Tells Her To Listen To The Last Track

So many questions

Did she take a record from the factory and press her hidden message into it there, using her knowledge of the machines from back in her working days?

But why? Why did she want a stranger to find her sister? Why didn’t she just do it herself? Mara’s mind was hurting from all the pondering.