Cassandra is the little girl saved from planet P8X-987 after her people were wiped out by Nirti, she was adopted by Dr Janet Fraiser and featured in several episodes.
However, after the 'Heroes' episodes in which Dr Fraiser dies
I don't remember her ever being mentioned or appearing in the show again - she seemingly disappears from the story line without explanation.
What happened to Cassandra? Is this ever covered in the remaining seasons of Stargate?