It would be illuminating if you asked the dealership for an itemized breakdown of the parts and labor costs in that oil change. Synthetic oil costs about $8 per quart these days. This car takes about 4 quarts of oil in a change. That would make $32 for the oil used. Where does the other $48 come from??? An oil filter probably costs about $5 to $10. How much does this dealership charge for an oil change for an older Honda that does not use synthetic oil?
DO NOT switch this motor to petroleum oil. There are many different issues which could be created; in addition to the fact that it probably will void your daugter's engine warranty.
Find an honest independent shop, and use only the same brand of 0W-20 weight synthetic oil that they use WHENEVER any oil is put in that motor; regardless of whether a single quart is added, or the oil is all drained and refilled. Keep the receipts in case there is a warranty claim. The dealer cannot legally make you bring the car to them for service. This car will outlast most other cars of that model; whose owners don't care about not mixing oil types or brands.