Mother
From The Stargate Omnipedia
Only name for Charlie's Reetou parent who arrived at the S.G.C. via PXY-887 and observed how to operate the Stargate's iris. Mother found the only truly honorable person on the base to be Colonel Jack O'Neill when she observed him and his reactions with Tonane and his people.
Mother destroyed a computer monitor in the infirmary, proving that she did, indeed, exist. She planned to leave Charlie behind with the Tau'ri, but before she left she was destroyed by Reetou rebels who successfully infiltrated the base through the Stargate.
DETAILS
FIRST APPEARED - Show and Tell
KEY EPISODE
Show and Tell - Charlie arrives at the S.G.C. after Mother opens the iris for him, and remains to prove the existence, and seriousness, of the Reetou threat.