Here they are in Animal Crossing:
They can wearing these outfits or something similar.
I have some doodles of what they would look like outside of Animal Crossing, especially for what their hair really looks like, buuuut I really struggle with drawing so I don't know how useful this is ;~; If this is all too confusing for her, she can just base it solely on the AC Screenshot.
The pose/expressions/etc. can be all decided by her ^^