Hi when my gal has scratches I don't put plaster as I am afraid she may be sensitive to the material of the plaster especially at such a young age their skin is still very thin. Weather is hot too so it is easy to get irritation from the plaster. I am also worried she may pluck off the plaster and swallow it? I think you should bring her to the PD to have a look and apply the correct cream. Sometimes the skin need to breathe to heal instead of covering it up, just make sure it stays dry.