She is caught in an impossible situation: like any diplomat, she is wired to be in good terms with everybody —including lethal polluters— …even as this prevents her from doing her job: speaking up for the climate and future generations.
She doesn’t want to resign in support of the 1.5ºC target that would save the future but lose an exciting job.
She is well-intentioned but myopic: she imagines that sustaining the social order requires not shaking too much the (er, destructive fossil-fueled) economic order.
She is intellectually challenged: easily swayed by pressure from powerful polluting lobbies.
Too many bills have been piling up, she’s totally broke and absolutely needs every dollar of the salary.
No vision, so having the spine to do the right thing is to expect too much: she hasn’t noticed that resigning over the suicidal 2ºC target would be remembered by history for rising to the salvation of civilization —and even if she has, she doesn’t really care for grand drama anyway.
Her children would have a tantrum.
None of the above.