I also think Amber is jealous Anna. Amber always looks disgusted when looking at and/or speaking to Anna. Anna seems to have the kind of personality that is very likeable, while Amber is an ice queen and people obviously don't like to be near her.
Amber, Alex and Jonah are just soul sucking people. They have terrible personalities and are just not pleasant.
I think Trent, Anna, and Emma would be much happier if they lived separately from Jonah, Amber and Alex.