When I was just in for Lou's last vaccination shots they said that the lumps are normal and it just takes a little while for the shot to work it's way in.
I would just keep an eye on it and see if it starts decreasing in size in the next 24 hours or so and if it hasn't by then, take her back in.
I would just keep an eye on it and see if it starts decreasing in size in the next 24 hours or so and if it hasn't by then, take her back in.