My wife creates prints for our fabric printer, and the PSD files are often larger than 2GB, containing for example a 55" wide image that is 6+ yards long, at 15

My wife creates prints for our fabric printer, and the PSD files are often larger than 2GB, containing for example a 55" wide image that is 6+ yards long, at 150-300 dpi with a bunch of layers. Somehow her low-specced 2015 Macbook Pro 13" has handled this type of work just fine, as long as there's enough free space for the scratch disk.