Sadly that doesn't work for everyone. Me, even a not-so-close shave gives me a fair amount of trouble with ingrowns. I think it'd be hell if I was going to put on thick special concealers on that. Though if she has healthy pores, yes, that's absolutely possible.
Luckily after some laser I mostly have light hairs remaining, so the shadow is virtually invisible. I'm freaking looking forward to being completely done with laser and finishing everything off with electrolysis. I'm sick of having the underside of my chin and the areas below the corners of my mouth almost constantly plagued with ingrowns. I might actually have somewhat decent skin without that.