No, it is not possible for a NON pollinated female to produce viable seeds.
In humans it would be known as "immaculate conception", however, as we all know, a woman can not produce babies all by herself.
Cannabis is a "diploid" plant, meaning it needs male and female genetic material to produce viable seeds.
If you find seeds on your plant, she must have come into contact with male pollen, there is absolutely no other way for a female plant to develop viable seeds.
Hope this helps, Organoman.