If someone in your life is toxic and causing you psychological harm then it is best to sever the ties IMO.
I cut both of my parents off...but you say love for your mother prevents you from doing that, so... In my case the constant abuse and neglect over the years made me so hurt and angry that the love died, and they don't love me, so it was an easy choice. But if you have your doubts then you should think really hard about it, it's a bold move and one that should be reserved as a last resort I think...