Thing is she may not want to get destroyed or stoned off her ass the first time. I did and had a blast, but we must take variables into consideration.

My two cents would be small hits no matter what the device. If its a vape, have her hit it like a hookah, long and slow and have her pull off whenever she wants.

Have plenty of water and good music at hand. And maybe a banana if you use a bong or something that can potentially "char" her throat. Stoners, you know what I am talking about on that one.