I must say it won't get better on it's own. My first real incedent with bunny health was alonggg time ago with my bunny Speckles, who at some point ended up with paralyzed back legs. We didn't know if she'd fallen, jumped funny, kicked funny or what had happend. Unfortunately, I wasn't able to take her in to the vet right away, and made the mistake of just watching her hoping she'd do better. She didn't get better, and I ended up having to have her put down. I still now wonder if I'd just taken her in early if something could have been done. And even if nothing could have been, I really regret letting her suffer at all like that.
For now, try to make her comfy, with lots of towels around her, make sure she's able to get to food and water (and is eating and drinking). Otherwise, help syringe her water, and hand feed her. Be sure to keep her area clean, as it isn't good for them to sit in wetness and poop.
That's all I can really say can be done without the help of a vet. Ultimately it won't help get her better but at least keep her comfortable for the time being. So sorry this had to happen to her, especially after only having her 2 days.
I'll keep her in my prayers.
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