The only words of wisdom I can offer her is that what works for one person might not work another. If the fleshlight was perfect for evefy man, then there would be no need for the Tenga flips or any other male masturbator sleeves or strokers. Same as there is no perfect vibrator for every woman. Yes some cost lots of money, but sadly that is no guarentee that it would be perfect for you.
Take some advice from what the others have said (hands free is a great idea) try different positions, use porn or other mental stimulation to take your mind off the fact its just a bit of rubbery stuff, not the real thing. Warm it up with warm water before using, maybe try different lubes to find the one that gives the best sensation.
At the end of the day, it could be that it just doesn't work for you. The Fleshlights are quite expensive and a shame to waste it on something that just doesn't work, thats why Lh have the fab fab fab returns policy!!