You get to decide what YOU want. Your mother does not.
From my experience, having a crazy mother who dissed me, be wary of triangles that they can create with your children. My mother loved to create triangles with other people in my family where she could align with them and blame me for whatever she wanted to at the moment. She got to blame me, and she got support from the other person, and she got to further hurt me by convincing them that I was wrong, bad, whatever her word of the moment was.
If you don't feel that you want your kids to see her, or if you don't feel comfortable dealing with her right now while so much else is going on in your life, there is no urgency to acede to her demands.
Take care of yourself and your daughters first.
ShootingStar1