Fiberglass Repair

Of course, it's your decision on how to fix it. You don't really need to repair this area with fiberglass cloth and resin. I did some damage to the rounded corner on the front cap of my FW a couple of years ago and repaired it myself. I used the type of plastic filler, similar to Bondo, with fiberglass fibers in it. Tape an area large enough around the damage and roughen it up with 300 sandpaper and a block. Mix and apply the plastic filler with a 4" wide plastic spreader. You can get these at any auto parts store. Let it cure and start sanding using a coarse sandpaper and block first being careful to match the profile of the surrounding area. Sand until the plastic filler gets down enough to start using a finer grit sandpaper to get a very smooth surface. (you should know when you're done sanding) I then used a 2" wide paint brush and painted 3 coats of white gelcoat and sanded until smooth using 800 grit. Now it's time to match the color of the FW. A body shop should be able to do this. Unfortunately there are no paint code numbers so it'll have to be mixed and tried until the exact color is obtained. How do I know this? Because my son owns and operates a full service auto body and paint shop. I did the repairs, he did the match and paint. It came out perfect. No way to tell. I would attach a few photos of the repair process, but I don't remember how.
In your case though, they offered to repair it for you.....go for it.