Initial concept, open to feedback (she can also take it in a different direction, what did you have in mind?)
There are two things that I would change.
1. The letters OFF should be tilting the same direction as the 50%. The way it is now, it looks very disjointed.
2. The words "DansDeals" should be larger. Maybe make the "50% off" smaller and "DansDeals should take up the whole last line.
Next, I need one that reads "I saved 50% on tuition because of a bumper sticker"