Most Helpful Girl
If you tell her, there's a chance she'll reject you, but there's also a chance you'll have a relationship. If you don't tell her, there's no chance she'll reject you, but there's also no chance you'll have a relationship.
So is it safer to never tell her? If by safer you mean less likely to be rejected, yes.
But, if by safer you mean more likely to end up in a relationship, no.
Most Helpful Guy
No, not telling her that you do like her is a bad idea. Finding out from her friends she liked you, but wasn't sure if you were remotely interested decided not to a risk and said yes to the guy that did ask her seems like it was the safer bet.
Choices, choices... lol2