She still has a while to go.
What you want to watch out for is her 'squaring off'; her belly will develop distinct corners at the bottom, especially in front; it will look like she's swallowed a box.
Once that happens they usually give birth within 24/48 hours, although females can hold on to their fry if they don't feel safe or secure and that often happens in those breeder boxes.
If you want some fry to survive, you'd be best advised to add plenty of live plants for them to hide in.