It's usually a good idea to get along with her friends, brownie points if they actually like you and respect you. This will make it easier because if you have a fight or disagreement they might stand up on your behalf or at least encourage her to work it out rather than leave you.
In your case when people around her are telling her to outright leave you now without cause, I would advise you to find out why they are saying this and try to show her you are not what they say you are or that those reasons are otherwise invalid.
I would also say try to meet some of these people (especially her friends) and show them you are not a bad guy yourself.
Avoid any confrontation or further polarization, as that will cause tension and if ultimatley you cannot be cool with her friends or you cannot fit into her surroundings she will not see you as a potential long term partner. It may not be a big deal at first, as in the beginning most relationships are isolated from the full lives of their participants. But eventually in every relationship comes a time when its time to meet the parents, the friends, and share at social events.
It's when entering this stage that her friends and associates hating you and wanting her to leave you will become an issue - almost overnight and quite unexpectedly - despite its near non-issue status now.
If you seek a long term relationship then your goal should be focused on putting out the fires and rising above the politics of the situation.