<human>: Provide a brief overview of the text.

*back story*
Okay so my sister (let's call her Emily) and I were close until she moved out.  She recently got married and since it was last minute, I wasn't able to make it because I had a midterm exam at the same time (his whole family somehow made it and no one from my family showed because she wanted to keep it a secret). She moved out with him a few months ago and we gave her our old dog because we couldn't take care of it. My mom and I still keep in contact with her and stuff but she seems more distant since she got married. Every time we tried having lunch with her, she says she's too busy. 

*what's going on*
So my friend is having a little party and she's only met my sister twice. My friend thought it would be nice to invite Emily because I told her how I missed her and stuff. Thing is, I Emily said that she would go and now she's bringing her husband with her. The reason I don't want her to go is because she's always saying she's too busy to see us but all of a sudden she's available and can go to my best friends party. I haven't even seen Emily's house! I got so mad and I don't know how to tell her I don't feel comfortable with her going.
<bot>: My sister is going to my best friends birthday party and I don't want her to go because I feel that she's been avoiding me and my family.