|The following is based on Fallout Tactics cut content and is not canon.|
Seedee spent most of her young life wired on tranquilizers, and since she went cold turkey she has lost all sense of fear. Traps don't scare her, and she's always looking for a new risk to take. The rest of the recruits have learned not to play poker with her though. You just can't tell when she's bluffing.
According to campaign description file, Seedee was supposed to be available for recruiting after the Newton mission, but due to some unknown reason she has never made it to the recruiting pool.
Seedee was supposed to appear in Fallout Tactics but never made it, either due to being cut form the final game or due to a bug.