After Tess thought her life was limited, she created a daughter genetically in a lab. After the lab was ambushed by cops due to them tracing Tess' movement, she had to abandon Tiffany during creation, leaving her to fend for herself against the cops that night and for the rest of her life. She grew up in an orphanage, which she was forced to abandon after radioactive creatures swarmed her home city.
Tiffany's story has been redone and reworked several times. Initially, Tiffany was just doing to be Tess' new design for 2016, however it was later changed for her to be a different person all together.
Then she was going to be a clone of Tess', which would lead to a whole different arc than the personalities Tess has.