Chaya Miriam Rubin - year of ptira

according to her son's hespid in עיני שמואל she was niftar on FRIDAY, 20th of kislev, תרי"ד.
the problem is that that date (תרי"ד) was on a wednesday.
from 1850 to 1859 the only years that was a friday were the years 1855 and 1859.
English year Hebrew year day of week
תרי"א 1850 monday
1851 תרי"ב sunday
1852 תרי"ג wednesday
1853 תרי"ד wednesday (year listed in hesped)
1854 תרט"ו monday
1855 תרט"ז FRIDAY
1856 תרי"ז wednesday
1857 תרי"ח monday
1858 תרי"ט saturday
1859 תר"כ FRIDAY
the closest correct year would be תרט"ז, two years later than listed in hesped