Ladies, how do I tell if I'm in the friend-zone?

You could ask. Hopefully, she'll be honest, even if it means you hearing an answer you might not like. I had to tell my current boyfriend (weird how things work out, huh? ) almost once a month, "We're just friends! "

If she likes more than a friend, she'll tell you. She's probably wondering the same thing about you, "Does he like me more than a friend? " OR she values your friendship, and doesn't want to risk it, like I did.

So all-in-all, no. I don't think there's an easy way to tell, unless asking her is easy for you.