I want to give you permission to do whatever you need to in your home to allow you to relax during this season and let your baby have her own relationship with your decor. Simplify!
Check out this site for paper ornaments designed for a Jessie Tree that would work great to print out (for free), color together and stick on the tree using good old scotch tape. The more your preschooler touched and created the ornament, the more she'll be content to let it sit on the tree. It won't be so mysterious and inviting. Merry Christmas!