She was sent to the Tamers by the Digimon Sovereigns to give them the ability to Biomerge in the real world, via the power of her partner Dobermon (he sacrificed his life to do this). After this episode Alice is not seen again. Writings released by Chiaki J. Konaka, executive producer of Digimon Tamers seem to suggest that Alice ``passed on'' prior to her appearance in the series and what was seen was actually her ghost.
Chiaki J. Konaka
Alice