Yes that is a very good copy of the original parish record, done by same hand. On the copy the word braiding has been written correctly and doesn't have the corrected letter in the middle of the word like the original. And definitely no "Margaret".
When Hannah jnr and her husband registered their children's births the oldest had the mmn as Clary, the others as Claravance.
So if Hannah snr was the one bapt at Bradwell -j- C, she moved to White Notley, had a relationship with someone, gave birth to Hannah jnr, then a few months later married Joseph Collard in White Notley. At some stage she re-invented herself as Claryvance or variants. The first time she is recorded to have this surname is when Hannah junior is baptised.
I have found some records for the other members of the Clary family in B-j-C, but have not researched them exhaustively, but have not found a marriage or burial for Hannah (as Clary), so that does look good for her being Hannah Claryvance.
The Clary family seem to be Ag Labs and similar, whereas the Claravances (from records I have seen on SEAX and ones people have posted on here) do seem to have been much better off - owned land, left wills etc.
Would an unmarried Claravance lady earn her living braiding straw? I doubt it, probably help mother supervise the servants and do a bit of embroidery until a man of suitable status was found for her to marry.
It's getting to sound like Tess of the D'Urbervilles - but without the infant death and the murder!