First Caketasprophy!

so today i disappointed my family by not bringing the cake for our family get together. what could go wrong went wrong and i am now so flustered and upset and rethinking my ability to decorate cakes and not jus cupcakes

The plan.

Simple one layer round cake. fondant covered with quilted pattern, gum paste bow on top. fabric bow around the base.

The issues

1. no marshmellows in any of the grocery stores to make the fondant. (really cant use the other type) plan b= buttercream

2. buttercream mixture too soft, icing sugar ran out. ok this was at 11pm so i decided ok the next day i will run to the store and get the icing sugar (mind u dis is the day its due)

3. buttercream jus would not smooth

4. gum paste bow that i had setting from the day before still soft and didnot dry. so that bow plan definitely out

5. i had some remaining flowers from some cupcakes i try to use them, cracking, breaking,  all in all terrible mess. 

all combined, ugly "unsmooth" icing,  no decorations of quality......equals breakdown.....equals me throwing the entire thing in the garbage.

what i need  help in or any tips on

1- How do y'all manipulae gum paste in the caribbean temperature. (it was a ready made gumpast)

(i know its a long post, but im pretty disappointed and upset about this entire situation