That drink sounds delicious. I have no idea what your friend meant, but it's not uncommon for friends to get jealous/snippy when they see someone losing weight. Just ignore the comment. Maybe she meant something, maybe she didn't. The important thing is, you're being healthy and getting fit. Good for you.
I'm going out for drinks tonight. I volunteered to drive, so that will automatically limit me to 1 drink (or 2 light ones). New weight loss strategy? Haha