My daughter has recently been bitten by the film bug, but she wants to do colour, in which I have little experience. Of her first 4 films, two with box speed 400 ISO were accidentally exposed at 200 ISO. She intends to scan the negs. Is it best to ignore the one-stop overexposure and process normally, or find a lab that will do pull-processing? Thanks to unexpectedly good weather, most of her shots will have high contrast and bright highlights.