On a serious note, the important thing to remember is not to let rejection ruin your friendship. I think a lot of people worry that if their good friend or best friend asks them out and they decline, that's the end of the friendship or it'll make things awkward. Maintain the thought that if she says no, it doesn't ruin anything. Continue to be a good, supportive friend. Some people treasure having a trustworthy friend they can rely on through anything more than they might a significant other.
You've got this. Just remember that it takes two to tango.
You've got this. Just remember that it takes two to tango.