Did I give her good advice?

Today my sister and I hung out with some friends. It was cool and all but towards the end they kind of started gossiping.

And yea people gossip but I'm usually quiet around people I don't really know so I'm very observant. And I noticed some of those girls do talk about eachother behind each other's backs. Even my sister tends to get mixed up in all the drama, she tends to over share too much.

And she can be very opiniated but I felt like she shouldn't talk about other people to these girls cause you never know who you can trust. Ive noticed the last few times we've hung out, they'll talk about these girls but it'll be about shit that isn't even a big deal. Like people make mistakes dude, we shouldn't talk about every single little thing they do.

Anyways my sis got drunk and she said something about this other girl and I knew she shouldn't have said it because one of those girls is her friend but the other 2 are not. So I texted her right away saying "don't be dumb, these girls are not your friends. It's gonna come up to you, you never know who they're gonna tell this to."

And I actually like these girls. They have good qualities, just like they have some imperfect qualities which I accept. But if it was up to me I wouldn't really trust them with a secret cause you never really know.

I mean we've all know eachother for about a month or so, and they're nice and fun but who's to say they're really your friend?

Anyways on the way home I was telling my sister to be careful about gossip because you never know who you can trust. I told her that next time they start talking about someone to just be quiet and listen, not to say anything. To actually pay attention. I told her that just like she's feeding into the gossip and talking about other people, they could just as easily talk about her when she's not around. Like the last time she and her friend were talking shit it was over the smallest shit that meant nothing. And I told her "are you guys gonna talk shit about me too cause I sit in the corner quiet and I'm never with the group?" To prove my point.

Anyways I did make her a bit anxious and paranoid at the moment because she realized she did overspill and she did fuck up but I'm starting to wonder if I gave her the right advice.

I mean I was never the best at making friends and I can have my guard up sometimes but I don't mean to project my feelings onto her. I just wanted her to take care of herself. And yea the world is cold sometimes but I don't think people are just bad. Maybe she has to figure out that balance herself? She tends to trust too easy or not trust at all. Maybe I'm just nervous to leave her alone when I go back home. ):