A hypo as far as Im aware is BCI (boa constrictor imperator) morph.....same species as a Colombian, but more commonly called a BCI nowdays.
A female BCI boa at 9ft long would be an absolute monster although it would be possible. 12ft is out of the question in my opinion. 7-8ft being more common for a female. However, it's a boa so you're in for the long haul as far as growth goes. They grow relatively slow compared to other species. Just keep that in mind and don't overfeed.
Do your homework even more so and keep reading...you should always know, 100% what youre getting into with large constrictors.