Welcome to the Beyond Blue forums Mrs H. I am sorry to hear how you are feeling and I am really sorry to hear you have lost your mum, my mother and father have passed and I know it's hard to come to terms with, if at all.
It takes time to move through the grief, I hope you can have the space and time to let sadness come and go, don't bottle it, you are allowed to be sad. I guess the trick is to practice control of our minds in between the moments of grief. Sadly we cannot change what has happened, all we can do is get back to living our lives in the moment, trying to bring our focus to the things that bring us peace and happiness.
I imagine that my mum is looking down on me, she would want me to be happy, she would not want me to be sad because of her. I feel that I can honour my mum by being the best person I can be, takes practice, and I believe that my mum will always have a place in my heart, she lives on in me. It has taken me a while but now I can think of my mum with love, not loss, I practice loving her, not missing her. I remember to be thankful for what we had, that she was my mum, that she was in my life. Try and stay focused on the present.
Perhaps you could have a shrine to your mum somewhere, spend an allotted time there each day or week then practice putting negative thoughts out of your mind, tell your self you will consider the sad thoughts when you revisit the shrine but you won't let it define who you are the rest of the time. I hope you can get back to your counsellor...much love to you.