Her arm looks pretty zombified now, plus the body rash, she must not have that much longer before she turns into one of them. (Though I'm hoping she doesn't because that would suck)
Yea, I suppose it's been about 28 hours since she was bitten but they've completely cut off the blood flow to the arm...that could be why it's turned that colour and why she doesn't look well...
Or it could be the other thing.