There's also the tendency for humans to rationalize a similar outcome from similar situations.
By which I mean:
1. Since Sally's mother is absent in the new Archie canon as well as the original SatAM canon, it's safe to presume she's deceased.
2. We like to honor deceased family members and name things after them.
3. A computer is an important part of Sally's life but needs a name.
4. Between the tradition mentioned in 2, and the fact Nicole does perform one of the key functions of a parent - namely, providing guidance - it is logical to name her after Sally's mother, or perhaps another great queen.
However, it is more likely she's named after a more distant ancestor given the "long past" quantifier. Even if she had died when Sally was a baby, it would be weird to call her mother "long past."
I think it's a safe assumption that Queen Nicole was a capable, wise, beloved ruler. Those are the kinds who get lots of things named after them.
Well, when they're dead, anyway. Lots of monarchs get things named after them while they're alive because it pays to be a suck up.