I'm going to fake an emergency in order to leave my friends house shortly after arriving to spend the weekend with her
Why do you want to leave her house?
I wasn't in the mood to spend time with people that much after arriving there.
It's wrong to fake something to get out of hanging out with a friend. You should always be truthful to your friends.
Now that you say that, I think you make a good point.
I'm glad to hear you say that. It's rude to back out of invitations at the last minute for no good reason.