It is possibly just a co-incidence that she has come down with a cold at the same time, but the cold-like symptoms can be side effects of the injections. Being BF does protect against illness, but it isn't a gurantee that they won't get sick at all, just that the risk is lessened kwim? If she does just have a cold, there isn't anything you can give her to get rid of it, just panadol if she has a temp and some baby balsam to help her congestion. Fess for little noses helps clear the nose too. If you are worried, by all means take her to your GP and get her checked out.