She’s a counsellor- counselling is supposed to get you to examine your behaviour and the motivation behind it, even if it is painful and difficult.
And there's a principle to this: if you reflect on your response to this suggestion, you may eventually want to reflect on why your response is so angry and outraged.
It can be, that when we react in a really really strong way to a suggestion such as that of your counsellor, it's a signpost to thinking about why your response is so strong. It sounds like your response to this statement is stronger than to other kinds of statements, maybe?
Obviously, there's the unspeakable grief over a lost child. But that's not all there is to it ...
Your response suggests it's not just grief, and that that grief is very complex. Your response might help you to unpick your really complex feelings, about your life as a whole.
Maybe she was trying to lead you towards seeing all parts of your life as a complete whole - your tiny baby now passed away from this world, and your living child, and your choices about how you spend your time, and your relationships with the living.
Grief never ever goes away. But you and your son are alive, and that's also important. Maybe that's the blind spot she was trying to get you to reflect on?