My theory about her feelings not being suppressed anymore is almost gone, stil not convinced, it could be that even if she is still connected to the world tree some of its effects on her are gone.
The story really pushes the wish fullfillment too much, MC is a unexperienced virgin that lost his job and in his worst moment, when contemplating death, a beautiful elf gets literally summoned in his arms and is his soul mate.
Wonder why he was so down when he talked about his past with the govenrment woman, is almost like he committed a crime, but is probably something stupid as not being good at his job and getting fired.