Last week I got in contact with vickvela because she's moving from Florida to San Antonio next week, and she has a couple rescues that would probably be perfect friends for Pikachu. So I'm just waiting for her to arrive and get settled so I can visit with them and make sure they'd be a good match for her, then they get to hang out in my brother's room (guest bedroom) until I know they are healthy and adjusted.
I don't know if Pikachu would even acknowledge a chinchilla-sized plush toy in her cage. She doesn't really get scared when she hears a noise. She actually runs to the corner of her cage to look down the hallway to see what it is. She likes to watch tv, so even when I'm not home, I have the tv on for her. I think she just misses interacting with another chinchilla. Like when I give her a twig, she nibbles for a bit and then drops it. But if I start trying to pull it away while it's in her mouth, she turns it into a game and will chew the whole thing while trying to keep it away from me. But thanks for the suggestion - I'll keep it in mind and probably make her a fleece buddy since I have some extra fleece.