The 1850 record with the initials, I believe, is hers. It is in the same town as the 1860 records. Another researcher indicated that her name was Keturah Cathrine so the C. fits.
1860 Lack Twp, Juniata, PA
Enoch Lutes age 24
Katura age 24

right next to

John Kepner age 40 born PA
Elzabeth age 40
Derwin age 18 student
Frances age 17
Jackson age 14

1850 Lack Twp, Juniata, PA
J Kepner age 39 female
E Kepner age 36 female
C Kepner age 15 female
E Kepner age 9 male
F Kepner age 7 female
J Kepner age 5 male
R Kepner age 3/12
R Hirsh/Fish age 14 male
S. McCahan age 24 female