oh sweets, i know its hard.
my advice would be to go and see her coffin in a sort of viewing situation before the funeral, it honestly does make it less confrontingi on the day. i still lost it compltely, but not as bad as i think i would if i hadnt of seen his little coffin the day before. i just sat with him for a while, talked to him, sung to him and kissed his name plaque.
On the day, u will get through, just like u've gotten through the past 2ish weeks, u will because u have to, u dont have a choice.

After Jack's funeral all ym family and friends went out and had a nice lunch then a few drinks at mums house to celebrate Jacks life in my belly.
we also requested no children
HTH in some way, but again everyones journey is different. much love xxx