I understand where Lauras Babies is coming from but then again she may miss out on something good if he likes her in return.

I'd ask her if he has shown ANY signs that he may like her. Even subtle signs. If so I'd tell her to go for it. It may turn out to be something wonderful.

If she truly has some serious deep intimate feelings for him & really thinks that he may be the one I'd act upon it, this may be her only chance.

If she is unsure if it would be a lasting relationship I'd lay low. Have her think things through, see if she could really be in love with him or now.

If he is not showing any signs what so ever I'd probably tell her to lay low just for a little while. Maybe have her throw out a couple of small moves that may be taken as a friendly gesture or a more involved gesture. Like when she talks to him maybe she can use her hands more & gently touch his arm or the like. See how he reacts to that.

I wish her good luck!