Neither. Clen is dangerous and anavar isn't a fat burner, nor is any steroid. Has she looked into sarms? Sarms are ideal for females to burn fat and build muscle, without the side effects and masculine sides of steroids
1-12 S4 50mg per day split 25mg am and 25mg 4-6 hours later
1-12 GW 20mg per day dosed 30 minutes pre workout
1-12 mk2866 12.5mg per day the first two weeks, then 25mg per day dosed in the am