Amanda,
I'm so sorry about the loss of your friend. She may have been your mom's confidant and companion but your knew her and probably loved her if for no other reason than your mom did...and that hurts. You go ahead and cry. You go ahead and remember her. You go ahead and mourn. And I say, if you want to go home and have a good cry then you should do it. And I think it is a wonderful testimony to how you feel about her that you can remember her fondly and smile. I'm sure she appreciated that in life and would want people to remember that at her passing. Hugs and prayers to you and your mom.
Gray