Gunna says she will not able to type the letter 'o', semi-colons or colons now the she has lost her finger. However the finger she lost was on her left hand, and those keys are on the right side off both the standard QWERTY and the Icelandic keyboards.
Gunna's finger is cut off cleanly. Given the short period of time that elapses between when this occurs and she is in hospital, it likely that the finger could have been re-attached if handled properly.
When Stella goes to Xi Feng's house, she is able to approach it and enter through an open door. Given that Guo Dai has been murdered and that the main suspect (Stella) is on the loose, Xi Feng would have been taking extra precautions for her own safety - keeping doors and windows locked and blinds drawn. There would have been security personnel provided for Xi Feng by embassy staff, if not the police. When the Store Owner and her group show up, they also just walk into house.
Gunna suffers a serious head wound when Guo Dai strikes her with the secateurs. She would have suffered severe concussion in addition to the brain haemorrhage mentioned by the doctor and would have been kept in the hospital for at least one day, if not more. Yet Stella takes her out, without any thought of the consequences. Just walking/ shuffling along could have raised Gunna's pulse and blood pressure and caused a relapse. Stella then leaves Gunna unattended in the building at the port without any thought for Gunna's medical condition.