The above article reads:
"Robbery -- Thomas O'Brien, John Foster and Thomas Spencer were charged with having robbed Rachel Whittle of a pistol, a dress, and a petticoat. By the evidence of the woman herself, it appeared that after she had gone to bed and was asleep, James O'Brien came into her room and got into her bed, and she was awakened by his trying to take a diamond ring off her finger. She got out of bed and ran into the bar-room. O'Brien followed her. She went to the door and screamed, when the police came in and found O'Brien concealed upstairs. She then missed her dress and petticoat. The dress contained $54 in the pocket. The house was searched, and the dress was found under the head of Spencer, and the petticoat in O'Brien's room, they being lodgers in the house. The parties were all sent to the Court of Sessions on a charge of grand larceny with the bail fixed at $1500 each."
A search using "Whittle" found:
2) Daily Alta California, Volume 2, Number 363, 10 December 1851
This article from 1870 reads:
If Mrs. Alexander Whittle, who left Sydney, N.S. Wales, on or about August 1850, and who, it is believed, was afterwards married to Mr. Thomas Spencer, will call at the Post Office, San Francisco, she will find a letter from an old friend, addressed, 'Mrs. Alex. Whittle.'"
She married Thomas Spencer? Really? The guy who had her dress under his head? Does this mean that Alexander Whittle was dead? Or did she know?
A search for "Rachel Spencer" turned up a whole month's worth of advertisements asking about her whereabouts:
4) Sacramento Daily Union, Volume 15, Number 2229, 19 May 1858
This 1858 advertisement reads (it ran every day in May 1858):
"WANTED -- Information of the whereabouts of Mrs. Rachel Spencer, who may hear of something to her advantage by applying, without loss of time, to H. Olmerd, Bernard street, between Mason and Jones, San Francisco."
Two search results using "Rachel Spencer":
5) Sacramento Daily Union, Volume 17, Number 2549, 28 May 1859
This 1859 article from Sacramento reads:
"Rachel Spencer, charged with using obscene and vulgar language on the public street, was adjudged guilty and will be sentenced today. The defendant was extremely obstreperous (probably on account of inebriation) during the examination of the case, disregarding the frequent warning of the Court, and finally compelling the Court to order that she be committed till 10 o'clock this morning for contempt. Upon the motion of her counsel and his waiving her presence and promising to remove her to another room, the order was rescinded and the trial proceeded, with the above result."
6) Sacramento Daily Union, Volume 19, Number 2829, 20 April 1860
This 1860 court notice in Sacramento reads:
"DISTURBING THE PEACE -- Lafayette Andrews, while under the influence of frequent potations, visited the residence of Mrs. Rachel Spencer alias Mrs. Trask, yesterday, and created a disturbance. He was subsequently arrested by officer Grant, on a warrant issued by Justice Foote, on complaint of the above named Rachel Spencer."
So I've found her as late as 1860 in Sacramento. And there is another name in the last article - Trask!
That's all I've found on Rachel (Morley) (Whittle) Spencer so far, but stay tuned. I now have another lead!
We still have to figure out what happened to Alexander Whittle.
During the search for Rachel and Alexander in the newspapers, I've also checked the San Francisco Chronicle on Footnote.com, the Ancestry.com newspaper collection, the Early American Newspaper collection available on the AmericanAncestors.org site, and the Chronicling America site at the Library of Congress. I have not checked GenealogyBank because I don't have a subscription.