You seem to have either an Emerald Damselfly/Common Spreadwing (Lestes sponsa) or a Scarce Emerald Damselfly/Robust Spreadwing (Lestes dryas). Only the former is widespread.
One of the main documented ways of distinguishing these two females is the position of the ovipositor in relation to S10 but that can be very difficult to judge. These two features can be easier to assess, IMO.
Emerald Damselfly/Common Spreadwing (Lestes sponsa) female
Scarce Emerald Damselfly/Robust Spreadwing (Lestes dryas)