Happyally, I am so sorry for your loss. I imagine it is something you never get over.
I hae a friend ho lost her daughter in tragic circumstances, over 30 years ago. I know the hurt lives with her every day. I don't think your friend is being insensitive. She too is facing a loss -and yes, she still has er daughter but she is moving away and the closeness they shared by being near each other is going. I felt the same way when one of my AC moved down south for work.
It hurt so much. My life changed - BUT it wasn't like the change you experienced. It was different, very different but her feelings are just as valid as yours. As HER friend I hope you sympathised?
Can I tell you about my friend (and I am not for one minute saying you are the same) but she wore her loss like a badge, a martyr to loss and sadly, her whole life became about the loss of her daughter. (It's been nearly 30 years now.) She imagined others felt her pain and every conversation tended to turn eventually into one about her sense of loss. (I know the pain she feels - she is a dear and close friend.)
It took a female vicar to take her aside a few years ago and gently, over tea, tell her loss affected many people, in different ways, and it wasn't always about her. My friend had upset others by making their bereavement about her, by turning the wake into the way she felt about the loss of her daughter. People were cross that this wasn't her moment, her time for sympathy.
I have probably worded that very clumsily. I mean to cause no offence, but maybe you need to appreciate your friend's loss and not think of her being insensitive? She is hurting too and a parting of the ways DOES hurt and take a while to get used to.
Sometimes you need to step outside your on pain to be a friend, don't you? You have friends by being a friend, and I'd say this a time for you to be a good friend and not the grieving mother.
I really feel for you, and wish you all the best, but let your heart, although broken, release compassion for others too.