Elizabeth, I find when buying commercial fondant, it can vary greatly from batch to batch. I make my own mmf, and add it to store bought fondant. I use Liz Marek’s recipe, and the fondant is great. If you don’t have time to fiddle making more, try kneading in some shortening. Then use cornflour when rolling out
Here is the link if you want to try making/doctoring your fondant:.
http://artisancakecompany.com/recipe/the-best-marshmallow-fondant-recipe-ever/
Also there is a “wrap around method” for tall cakes. Here’s the link:
http://sweetnessandbite.com/2016/07/how-to-wrap-a-cake-with-fondant/
Hope this helps.
Creativity is God's gift to us. Using our creativity is our gift back to God. Clarky's Cakes 😎