The eyelid skin is extremely thin and tends to form fine lines due to frequent motion and also the lack of UV protection. Fat transfer or repositioning is an effective tool to rejuvenate the eyelids and can be safely combined with a variety of other rejuvenation procedures. Prior to considering laser resurfacing you should have a daily routing that includes application of topical Vit C and E serum and use of sunblock. These will prevent uv damage that promotes aging of your skin. The best sunblock for around the eyes are the micronized zinc powders that are available from several different companies. If you decide to proceed with the laser rejuvenation, this daily regimen will protect you from prolonged redness and/or hyperpigmentation post procedure.
It is safe to get CO2 laser resurfacing after fat grafting. The laser resurfacing should not affect the fat that has been transferred. On the contrary, it will likely enhance your results. Best wishes.