How do I describe my activity level??

It depends on how much walking you do in sales. If you're just standing for the shift, I'd still call it sedentary. The last time I was working retail, our department was about 40x75 feet and I spent the entire time walking all over it. I moved my level up to "Lightly active". (I also was sticking to my calories, drinking at least 2 liters of water per day, and was losing an average of 10lbs per month. )

It's always better to under-estimate calories burned and over-estimate calories eaten.

It depends on how much walking you do in sales. If you're just standing for the shift, I'd still call it sedentary. The last time I was working retail, our department was about 40x75 feet and I spent the entire time walking all over it. I moved my level up to "Lightly active". (I also was sticking to my calories, drinking at least 2 liters of water per day, and was losing an average of 10lbs per month. )

It's always better to under-estimate calories burned and over-estimate calories eaten.

You would think so, and I've traditionally done that, but precision is desirable because, well... Doing both of those things can put you into starvation quicker than you thought possible.

I'm with ^, but if you're also exercising every day or every second day, you could probably safely amp it up to light activity.

Not if she's counting her exercise separately.

Good point. I used to use Calorie Count, where the definition of "light activity" was "lots of standing throughout the day, moderate amounts of exercise". I forgot that this site has an exercise log.