In addition you will need to issue 1099s from your mother to the trust for it to use on its 1041. (assuming it had more than $600 in gross income in 2017). The trust became irrevocable after your mother passed and you need to get a tax-id # (EIN) for it and may need to file a 1041 depending upon its income and if the trust continues or if it ends.
You should probably review IRS Pub 559 in some detail and consider consulting with an estate/trust attorney, or a CPA or enrolled agent who specializes in trusts and estates (most don't). <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/p559.pdf">https://www.irs.gov/pub/irs-pdf/p559.pdf</a>
[EDIT] See in particular Pub 559, page 5 "Income to Include" and "Forms 1099"
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