Seven was on the rebound from Axum in "Human Error".
I prefer to listen to the actress's comments on the C/7 anomaly.
and specifically, this passage...
The next episode that we shot after that (Natural Law), Seven and Chakotay were stranded on some planet together. We specifically asked the producers – Robert and I – “Now, are we going to play this? Is this going to go somewhere? Because, obviously, we’d need to carry something over from…’ And they said, ‘No, no, no, no! Absolutely not. Don’t play any of that. Nothing’s going to happen.’
Take away message from this... don't trust the producers.