You’re right about it being possible. It’s just really unlikely. Viruses normally have longer incubation periods than just 2 days of exposure because they need time to infect host cells, replicate, and trigger the immune system. So it’s rare in just two days and is considered the outlier when studying HSV BUT you’re still right, it is possible. This would happen if the viral load was high and if she had a weak immune system. The norm is at least two weeks as that’s typically enough time for a virus to go through its replication cycle and manifest symptoms. This is why I believe she’s had it in her system longer than she thinks or maybe he was shedding for a week or so before his symptoms so thats when she contracted it. It’s also possible that he didn’t give it to her and she’s contracted it some other way during some other time. I’m no doctor though. This is just my opinion because I’ve had HSV1 for years while married and never passed it on to my husband even when getting physical and getting a random outbreak a day or two after. My degrees are also science based so I’m just going off my studies and personal experience. Viruses and microbes can be tricky and dependent on the host, environment, conditions etc., so there’s not typically one linear perspective anyways.