From the last chapter of The Renegades of Pern, slightly abridged:
Lessa greeted her warmly, expressing delight that Aramina had rediscovered her ability to contact Dragons. Upon questioning, it appeared that Aramina had not heard Ramoth and Mnementh as they arrived.
'I do hear the fire lizards,' Aramina offered, 'And I also hear someone - something else - occasionally. Whatever it is, is very sad, so I don't try to hear it.'
Was it ever revealed what Aramina was hearing?