I lost 3 like that. One moment they looked fine. 15 minutes later, three were laying on the cage floor lifeless. And they were 4 weeks older than yours. I just REALLY want to stress that bunnies have extremely sensitive gut flora. Once its messed up, its messed up. I've been through it with multiple bunnies. Please, just be really careful what you feed her as far as fresh things. I'm really worried she's going to end up with an upset tummy-I personally would stick to only formula right now until she's older where she can handle more and has a more estable GI tract.