How dare the adultress have any say at all in you texting your husband. How can she demand any type of loyalty or have a comment on anything?
I would keep right on texting whenever I felt the need to. Not over excessively or anything but shoot why should you bend to them? They disrupted your life with their mess and I just dont see why you texting your husband the father of your children is a "bother".
She has nothing to do with your children therefore she should have no influence in how you interact with their father.