She looks to be, although not on the verge of labour.
Here is a great guide for discerning how far along she is.
It's always safe to say that most female livebearers, if at any time in their life have been in the presence of a male, are pregnant. They can store sperm for months. It's great if you want fry, but since they can drop 50+ fry at a time, it gets old fast