My long distance girlfriend has been in sorority (since before we started dating) and im worried that its distancing our relationship?

So my girlfriend and i have been dating for about 9 months now. But we dayed as juniors in highschool for over a year and broke up but we got back together this past summer and now we are both sophomores in college. She joined her sorority 2nd semester freshman year and she kind of turned into a different person in the aspect of getting with a lot of guys in a short amount of time and drinking. But ever since we first left for sopho yr, she doesnt like to get blackout drunk anymore, which im glad, but i always still worried about her going out every weekend. We’ve had our ups and downs with this problem but now its really starting to bother me. We are a couple months into out 2nd semester and it seems like her sorority is taking over her life. I get it can be hectic with new girls to the sorority but at the beginning of the semester she barely had any time to facetime or go on the phone with me, let alone she always forgot to answer my texts. First semester we would facetime for hours and shed get so mad if i didnt text her back within 5-10 min. At first i hated it, but now i miss it bc it feels like we barely talk anymore. This past weekend she wanted to go out on a Thursday night and I really didnt want her to but i cant tell her how to live her life. So she went out and some frat guy was dancing with her (and her friends so she tells me) and he tried to lean in and kiss her. But she told me she told him she had a bf and she couldnt.