Solution for night-time?

We specifically went with the Nanit Pro because we liked the app connectivity and not having another monitor to carry around. That said, we didn't think ahead to when our daughter would be in her own room and crib at night...

I'm aware Nanit has night mode where you can basically leave your phone on and it wakes if it detects any sound or motion. But it also doesn't detect sound if white noise is being used, lol. Does anyone know of a good solution? Or are we going to have to shell out for an extra cheapie once she moves