55-366 grandmamas birthday

Making Grandmama's birthday cards and cake - why can't I master cream cheese frosting? I totally follow the recipe and I've tried loads of different ones and it never works, its always way too runny. If anyone has any tips I'm open to as much help as possible.We has loads of fun painting, sticking, icing and doing jigsaws.But........

Poor Mini has hand foot and mouth so we couldn't go to Grandmama's bday party. Never got a taste of the cake! Wee lamb she doesn't seem to bothered by the blisters, but she if definitely no right, she just wants mamma all the time, so we have done lots of cuddling and non stop boobies.