Rousseau vs Dharma

This has probably been covered before but I guess I missed it. Pardon the repeat.

Rousseau landed on the island in 1988, the Dharma purge didn't happen until 1992, 4 years.

Why didn't Rousseau contact Dharma or Dharma contact Rousseau? Dharma people had to know Rousseau was there, at least I think they did. She began to broadcast her message from their tower in 1988, so they had to know some one was in distress on the island. Why didn't they reach out to help her?

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