So i wasn't the only one to think that (though the poor reading comprehension crack was a bit unfair). her real name is mentioned only ONCE, in wyrd sisters. i just figured it was always implied but never settled and since terry changed a bit since then, well, i chaulked it up to being like the patrician in CoM. you know? Ideas by a less experienced author.
and it would fit more, be more significant, more than a vague mention of someone you never heard of (allison i mean). and would fit with terry's cynical views. IE there were all these fantastical stories about her, and everyone SAID she was bad (Aliss) but in the end the real truth was that she wasn't bad, not really. Just a showy, quirky, witch.