From what I recall from another telling of the story Pixar was the one who set her up with a home computer & storage system for that purpose - since the storage and computing power needed was higher than what most people would have at home - but I could be misremembering
You're on the right track. As told in the Next Web story, the workstation in question was a Silicon Graphics Octane or there abouts. These were incredibly expensive and were provided by the company. In addition, according to the story, they were the ones who set up the file sync for her to be able to work from home.
