I haven't found this bug mentioned anywhere. I gave Mrs. Pankhurst the flower, after which she left the puddle. Then saved and went to bed.
Now after loading my save, I get the prompt to give her the flower again, but she is on the road jumping in a non-existent puddle. I can't give her the flower again despite the prompt being there (maybe because she is in the wrong location?). I then went back to the main menu to reload the save again. Mrs Pankhurst is still jumping in a nonexistent puddle on the road, but now the prompt is gone and she isn't highlighted.
It doesn't seem like I can complete the quest anymore now. Really regret starting it before heading to bed.
I'm on Xbox, build v1.8.86029