Hi Concerned Father,
Many of us use what is in our local Wal-Mart, spray gel or regular lotion. Some members have a favorite sunscreen and others don't. It is really personal preference; make sure it is 50 SPF.
I use the spray gel (Banana Boat, SPF 50) for Summer and the lotion (No-Add) lotion for Winter; SPF50. Make sure it is rated SPF 30 minimum; preferably 50 SPF. I put on sunscreen prior to make-up first thing in the morning. Right around the end of September I make a trip to Wal-Mart in order to stock up for the Winter and Spring months. The spray gel lasts longer and doesn't have to be re-applied which is a plus in the Summer when it is hot and lotion has be to re-applied every 2-3 hours. I keep a spare spray bottle in my car in case I forget to put it on with make-up.
The darker the clothes the better and a dark hat. Clothing made out of nylon is sun proof. Another option is to check out the coolibar website that sells UV clothing. They are currently having a sale on hats, pants, and blouses. Keep receipts for uv clothing and sunscreens as they are medically necessary if diagnosed Lupus DLE (sunsensative). I love coolibar's clothes and it saves me several steps if all I have to put on is sunblock on my face and hands only.
They can be written off as a medical expense in regards to yearly taxes as long as you have a doctor's note. The same goes for tinting car windows and house windows with UV film in order to protect ourselves from the sun. I hope I haven't thrown too much at you, and I hope this info helps. Your daughter is very fortunate to have someone who cares sooo much.