Name	Lifeboat from Titanic	Lifeboat to Carpathia	Confidence Level
Roberts, Mrs Mary Keziah	11	11	4.17

Daily Mirror, May 4, 1912:
“Mrs. E. Leather, of Birmingham, gave me a succinct narrative of her escape in Boat 16, which was the last on the port side to be filled, at about 1.30. The master-at-arms, Mr. Bailey, was in charge, and there were two sailors and two firemen, the rest of the 42 on board were all women, mostly from the steerage, except two foreigners, who hid under the seats. Miss Marsden rowed all night with the men, Miss Jessop and myself nursed two little babies. Miss Gregson took charge of a little French baby all night, and Mrs. Roberts also had a baby, but they were in another boat.”

A website for the shipwreck of the Rohilla, which Mrs. Roberts also survived, had communication from her descendants who claimed she was in boat 11, but did not provide an account pointing to that lifeboat.
http://www.eskside.co.uk/ss_rohilla/mary_kezia_roberts.htm?fbclid=IwAR3is2Cxp2WwuBUmq7LACUfHxRaAmmlIrEFvvTgdmUUsRIMxiK3VsPVlfyQ

A letter written by Edith Rosenbaum (Russell) in 1970, to Mrs. Roberts daughter, relates the following:
  "Your lovely mother was my room stewardess.  She was in lifeboat 11.  So was I."
We are sure that Rosenbaum was in #11.

Unfortunately no direct account by Mrs. Roberts has been found.

Discussions centered on fellow stewardess Elizabeth Leather’s account, which is very specific that Mrs. Roberts was not with Mrs. Leather in boat 16. The wording implies that perhaps Mrs. Roberts was with Miss Gregson, who we felt may have been in Collapsible D, due to the French baby (the Navratils) or possibly in #11.

But the Russell / Rosenbaum letter, even though written many years after the fact, went a long way toward showing us that  Roberts was very likely in #11, though we cannot be 100% sure.