Mistake contacting her, she was getting mad that you have not contacted her? Good, that means she was starting to want the contact, now that goes back to 0. She is still controlling you, now is the time to give her the space she wants, because you have better things to do!
Be very careful with the MIL, when it comes down we all get behind blood, its just how it is.
Burt
Yup, yup and more yup.
Dburt knows his stuff, listen to him.
Don't trust the in-laws as much as you love & respect them.
Blood is always blood and you are just an in-law.
If she cheated on you, she would twist it around in their eyes and they would support her for it and be angry with you afterwards because "you pushed her" into that behavior.
I would institute no contact with them also.
Create some mystery in your life by not sharing details with her family, in a way, it's still you contacting & pursuing her when you talk to her family.