Oh yeah, I'm sure it is related to the earthquake! My husband is very sensitive & perceptive like most children & animals are, and he was very off-kilter (irrationally angry & extremely tense) the previous day, then right when the earthquake happened he started throwing up! He was very sick for the next 12 hours or so.
I don't remember what my kids were like before the earthquake but my husband always picks up on those kinds of things & he felt it coming just like your daughter, your friend's daughter, and your mom's dog.
Funny how that kind of thing is possible but it definitely is.
S.