I don’t like my girlfriends best friend. Can I do anything about it?

My girlfriend and I have been dating for 14 months. We’ve lived together for 6 of those. I moved in with her. I don’t like her best friend and made a rule that she can’t come here. My girlfriend responded by making sure she goes to her friends house once a week. She even has a key. They don’t have a sexual relationship at all, I know that 100% and believe both when they tell me they’re just close friends. But I don’t like her best friend. I think it’s stupid they make sure to hang out once a week. Who needs to see someone they’re not dating so regularly? Is there any reasonable way to ask my girlfriend to stop hanging out with her? Or do I just deal with it?

What do you do if you can't get along
What do you do if you can't get along
I don’t like my girlfriends best friend. Can I do anything about it?
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