Irrevocable trust tax preparation.

On Feb 4, 2016 my mother created an Irrevocable trust.  I am the sole Lifetime beneficiary.  Although she has since passed away Jan 19, 2017.  It is a Grantor Trust with her as the Settlor. There is an EIN for the trust. How do I prepare her 2016 tax return for the trust.  I purchased Turbotax for business to do the preparation but there is no provision to prepare the return, it seems it only prepares K1's.  How do I actually prepare a federal income tax return.  Isn't the trust a separate entity?