Sabine can certainly be captured, as that is the strategy Arinette would want to take for one of Meesei's packmates. She knows how much of a weakness their personal connections can be. 

I don't think I would want Sabine to be killed at this point. That might bring an end to certain plot lines before they could really be brought to fruition. However, I do have some ideas of things that could happen in her captivity to further her own character. Though, I don't imagine Arinette will make it a pleasant stay.