In the Resident Evil movie series, it states that Alice is infected with the virus, and is the only one who was able to bind with the virus in a cellular level. So, it seems like the T-Virus doesn't kill her.
The question is, is she immune even to undead bites? What if one of the mutated creatures bites her ( Such as the one that left a scratch on Matt and turned him into Nemesis )? Does the T-Virus mutate Alice again?
The movie doesn't include a scene of her being bit, so I don't really know what happens if she is.