MIL Issues

Today my family went to the pumpkin farm.  It was myself, my husband, our 3 children. my mother and my mother-in-law.  The kids had a great time, I had a good time with them.  My 18 month old went on his first hay ride, it was just a good time with them.
I have mother-in-law issues though.  Last year when my husband and I separated, my MIL was really spiteful and once confronted my mother and listed out all the things that were wrong with me (I was bipolar, my blood sugars were out of control, I was about to have my period etc.).  Just completely tore into her about what she thought my problems were.  And honestly, throughout our marriage she has had a lot to say about things that are none of her business, a lot of judgments that are unwarranted, she has made a lot of issues in our marriage.
My husband and I have really made an effort to redraw those boundaries and let her know where they are and that while we care about her and her feelings, there are certain things she doesn't get a say in. 
My problem is that I still am angry at her.  Every time I see her I remember the crappy things she has said to me.  The troubles and headaches she has caused.  How dare she do that to my mom?  Like she and her family are so perfect?  It just really irritates me.  I have known that she was going to come along on this trip to the farm and have been trying to prepare myself, but still it was so hard to keep my anxiety at bay today.  Even now that it is all said and done, I am still fighting off the anxiety.
Just a blah kind of day, anxiety wise at least.