You say its a female & its green in color? Male carpets are typically green. Females are normally black background color with multiple colors of dots all over their body when gravid. I had a cb pr a cpl of yrs ago. And my female was mostly blue with some green when she was receptive. So if shes showing predominantly green coloration she is either a he, or she isnt gravid.
Which subspecies is it your getting? I had the smaller species lateralis lateralis.