Saying something when you're drunk should not be the issue. And what you said to her should not be a problem neither.
Now that both of you are sober, just keep your communications open. Mention to her that you've notice a change in her behavior and that you think it's from what happened during the get-together... Just ask her straight - is there something bothering/worrying you? (instead of beating around the bush, asking for our perspective.) Listen to what she says and go from there.