I know some about detaching psychic cords. Same idea as DH with some variation.

I had a teacher who advised any cords are unhealthy with exception to a mother and child under 5 years. This is true for me personally too, I don't do the maintenance as often as I should, this is a good reminder.

So if you envision running silvery Kundalini energy up your spine out through head, she blends with Shiva, and then this energy like a misty rain of gold gently rains on you and fills your aura, this energy is enough to cleanse your aura and detach any casual cords.

More serious cord, like with your mom, needs to be found and detached. The energy in this cord is mostly going one way from you to her, and it's draining you. In detaching it, keep in mind, she is used to this unhealthy energy flow from you, so a straight cut could cause a psychic backlash from her whether she realizes or not.

So you feel around your aura, with your mind, for any dark spots, hot spots, and you can usually find where the cord is. It may be connected to a chakra or to the edge of the aura. Let your mind follow the cord to the other side to see who is connected to. You gently detach the cord thread by thread, almost as to keep peace with the other party and avoid upset to them. When the cord is detached, envision it in a white bed sheet of light and wish it be sent back to Source for healing. Then, the spots where the cord was on both people is like a little wound. You put some golden light on it to help it heal.

Thank your higher Self, higher power, guides, God, Godess, or any deities you've called on to help with the process, and it's done.