Serako does her best to carry Alissa towards the nearest hospital, by the time she gets to the edge of the park, it is obvious that she isn't making it to the hospital. Not that she was really happy doing that in the dark anyways. She calls a taxi and waits in the middle of a light's field of illumination.
She tells the man to take her to the hospital, that her... jogging buddy collapsed.
Once at the hospital, she will register the woman as best she can, being not a family member, and try to appeal to the hospital that she should be allowed to remain with her until recovery.