How to tell if her friends actually like you after a meetup

Start with the behavior you can remember clearly. Did any of them ask you a question that went past small talk, like what you do or where you grew up? Did someone tease you in a friendly way, which usually means they've decided you're in the group now? Did they include you when they got into an inside joke, or did they keep talking around you? Those moments tell you more than anything they say afterward, because most people are too polite to say what they think of someone they barely know.

Pay attention to who looked at you when you talked, and who checked with her before answering you. If a friend seemed to be quietly evaluating you, that's not a bad sign on its own. Protective friends often take a while to warm up. What you're looking for is any sign that someone had fun with you, even briefly, because that's the thing she'll remember when she thinks about the night.

The way she brings up her friends after the meetup is often a better signal than anything they did. If she mentions a friend by name and tells you something they said, that usually means the friend said something positive, or at least something she found amusing. If she only refers to them in passing, or mostly talks about the plan you made together, the friends probably didn't leave much of an impression on her, which doesn't necessarily mean they didn't like you.

Also notice whether she seems more or less comfortable with you since the meetup. Some people get more open after their friends approve, because they feel less like they're being watched. Others pull back for a bit, not because anything went wrong, but because they now have a clearer sense of how the people in their life will react to you. Either response is information, and neither one settles the question alone.

After a meetup, your next message does more to answer the question than any amount of decoding. If she replies with energy and suggests something specific, the friends probably weren't a problem, and she's already moved on. If she replies briefly, don't assume the worst yet. Give it a day or two, because people are often busy with their own week and the reply speed tells you very little on its own.

If you don't hear back after a reasonable gap, send one follow-up that's easy to answer and doesn't ask her to explain herself. If that also goes unanswered, let it rest. A week of silence after a meetup is a clear enough answer, and no amount of re-reading the night will change it. Stop before it starts to feel like you're trying to win back the friends' approval through her.