When did Rosina's husband Joseph die?
Was it 1942?
BERRY, JOSEPH 77
GRO Reference:
1942 S Quarter in BIRMINGHAM Volume 06D Page 253
https://www.findagrave.com/memorial/246653468/joseph-berryThere's also this entry - index only no image
Joseph BerryBurial Date Sep 1942
Cemetery
Warstone Lane CemeteryBurial Place Birmingham
Birmingham, England, Birmingham Cemetery and Crematoria Records, 1836-2017Can't see an entry for a
Rosina Berry at that cemetery there is one for a Rosina Williams in Apr 1895 but her age on GRO indexes is 12

As you say interesting that Joseph Berry is noted as 'married' 1921 & 'M' 1939 and 'widow' 1911
If she was still alive after 1891 perhaps she was in a hospital or medical facility
