they cant take away the fact she enjoyed doing it
whether her dad helped her or not, she was shown many times painting and actually enjoying it, that's all that should matter. She wasn't being forced into 'painting or else no dinner' heck she used her brush as her magic wand many times and making those cute explosions and gun sounds.
I would like to see an update though of older Marla. A 'where is she now' thing. If this thing screwed her up or not.