In the May 1919 passenger list with Bridget Carroll & Catherine Morrissey, Catherine also has a child Michael J. Morrissey, age 3 with her.
Considering that and the previous mention of Mrs. Morris Morrissey, I think Catherine's husband was the Maurice Morrissey of the naturalization papers here -
https://www.familysearch.org/ark:/61903/3:1:3QS7-99HD-T4KC?view=index&action=view The Petition for Naturalization said his wife Catherine died in Ireland on 20 Sep. 1919 and his son Michael was born in NY on 25 Apr. 1916.
Catherine's death record was signed by mother Bridget Carroll.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1919/05134/4414041.pdfMaurice Morrissey, widowed, age 25, sailed from Southampton to NY on 16 Apr. 1920 and the passenger list shows him going to sister-in-law Margaret Long.
Son Michael's marriage license is here, and his mother is listed as Catherine Carroll -
https://a860-historicalvitalrecords.nyc.gov/view/11405423Michael's obituary is here -
https://www.newspapers.com/article/the-jersey-journal-obituary-for-michael/145888049/ The New Jersey death index lists him as born 25 Apr. 1916 and died 22 Nov. 1995 in Secaucus, New Jersey.