Casio G-Shock DW-5600E-1 Fox Fire - Lina Esco - S.W.A.T.
In the actual series, it looks like she is mostly wearing a Casio G-Shock GA100MB-1A.
This DW-5600 is a classic and famous model from Casio, designed in the 1980s and still a popular Casio watch with now many variations available.
Interestingly enough, it looks like Lina Esco wears the Japanese market version of the Casio G-Shock DW-5600E-1, which can be recognized on the text "Water 20Bar resist - Fox Fire" instead of "Illuminator - water 200m resist" (compare models in the photo).
The Japanese model is obviously available in Japan, but also on Amazon.com or eBay in the US - at quite a premium compared to the International version of the Casio G-Shock DW-5600E-1 - which is $44 on Amazon, compared to the $76 for the Japanese model - which is exactly the same apart of the Fox Fire/Illuminator text.
Find more watches from S.W.A.T. here.