A tired and not very thoroughly thought out guess, but I looked "consecrate" up on Dictionary.com. Among other definitions, it means:
4. To dedicate solemnly to a service or goal.
Then I looked up "oath". There are two other definitions, but the first definition and its subdefinitions seem to be what we want:
1a. A solemn, formal declaration or promise to fulfill a pledge, often calling on God, a god, or a sacred object as witness.
1b. The words or formula of such a declaration or promise.
1c. Something declared or promised.
So, I conjecture that
Elizabeth's meaning is just all in the wording. It's sort of like
Abigail's meaning, which I have seen worded as "my father is joy", "my father is joy
ful", "father's joy", "father rejoices", and "my father rejoices".
Miranda