First, this needs to be addressed:
A woman who is going to clubs now is very unlikely to be a good godly and faithful wife in the future. You need to get away from this girl and focus on serving Jesus Christ.
Read Proverbs 31.
One of my closest, most respectable Christian friends enjoys clubbing, yet she just got engaged and will certainly be a good and faithful wife. Proverbs 31 says nothing related to clubbing. However, read the chapter anyway and consider what it says. Don't date someone with poor character.
Clubbing isn't inherently evil. Jesus drank. Jesus partied. Dancing is fun and God-created. The trick is to realize when an activity becomes a stumbling block, which requires wisdom.
Try reading Romans 14:13-23.
That said, from what I know, her friends seem like bad influences (clubs are debatable, strip clubs not so much).
As mentioned...
1 Corinthians 15:33 has been my mainstay for stuff like this: "Do not be misled: 'Bad company corrupts good character.'"
Influence is a powerful thing. Your girlfriend's friends influence her, and she will certainly influence you in return. Ask yourself: is this influence good or bad? Is this relationship building you and her up or are you tearing each other down? Because why be in a relationship if you fail to help each other grow.
My advice: encourage her to consider the people she surrounds herself with and how they influence her. Ultimately, your relationship should be building both you and your girlfriend up, and bringing you closer to God. Seek out what's best for her. If she fails to reciprocate, you may need to consider cutting things off.
My goodness there is so much to say on this topic, but for the sake of brevity, I'll stop here
