The zoo still don't know anything, I'm guessing if she shut down the birthing process last time, she may be producing enough stress hormones to delay it (if this is even possible, I know very little about elephants), but then is there even a precedent for inducing a birth in elephants? Hopefully, timing is still within the healthy window for them not to be worried. Judging by their site, Colchester appear to be one of the few establishments that do not gloss over the reality of a large collection of animals, so even bad news will probably be posted if indeed that is the case.