Photography business - pricing?

[mccannable]

My wife started a photography business and we havnt had issues with her standard shoots but got offered a job doing family photography at the local high school bachlorette this year. It's outside her normal pricing structure. We don't want to overprice(not a high class town/school and dont want to leave money on the table).

She will have an onsite set up and take family portraits at the event. People are signing up for 5-15 min time slots. They only pay when they buy the images(although we will offer prepayment discounts). It will most likely be a small number of images.

The event coordinator didn't have info on last years pricing but said about 50 families signed up.

Through your small town goggles we are open to insight.

An example of Her pricing is about $120 for a small on location family shoot with about 20 images. (Usually and hour).