Engagement reactions

So my new boyfriend of about 5 months proposed yesterday, best day of my life by far. I had gotten out of a long term relationship about 3 months before I started dating my fiancé and I woke up this morning to my ex’s mom just blasting me on social media, were talking a bunch of posts on everything. I blocked her on Facebook and Twitter and then I replied to one of the posts on Instagram which I shouldn’t have but I really couldn’t stand the things she was saying about me. I just want to know if I said the right things or what I should do about the situation. She needed up replying back to my comment but then deleted the post before I could see what it said. So I just blocked her. I know I shouldn’t have replied but I felt really attacked and disrespected.