Once the transmission ended, Yekaterina made no further log entries. Based on biometric data, it appears that she systematically depressurized all the units of the station except for three: her quarters, the central corridor, and the arboretum.
The cherry trees in the arboretum were in full bloom, and Yekaterina apparently clipped all of their blossoms one by one over the course of the next 36 hours, stopping only to eat food stored in her quarters and to use the bathroom there. Once she was done, she laid out her EVA suit on the bed and filled it with flowers before closing and locking the faceplate.
What telemetry is available suggests that Yekaterina’s next action was to move through the station, pressurizing rooms ahead of her and depressurizing them behind. When she reached the main airlock, she overrode the safety mechanisms with a screwdriver and opened it.
To this day, no trace of her body ahs ever been found, and the reasons for her final actions remain a mystery.