repairing natural plaster and limewash

As my kid reaches 4 years old, I'd like to think that the major 'ding' damage from her flailing around is coming to a close.  

so how to repair my white, lime-washed, natural plastered walls so that the repair doesn't look like a franken-scar?  

here's a recent blog post with a batch of photos: ideamountain

and here's my attempt to drop a photo of a pretty typical ding here:



simply wetting it down and attempting to put some plaster back in has not been a great success.  it's been about 5 years since this plaster was put on... seems like it's not too pliable anymore.

and of course we live here, so replastering seems like a crazy idea....   any suggestions?

there are lime based fillers for that. you can use a sponge to give the filling some structure, to blend it with the rest of the surface. then use limewash