Bianca, attendent to Matilda is garrulous and a gossip.
She informs Matilda of servents' accounts of happenings about the castle.
She chatters on lovers and seems to believe she's more worldly than Matilda. Now she's a great princess, she can expect marriage, perhaps to a handsome prince- a young hero 'resembling the picture of the good Alfonso'.
When Matilda and Bianca are aware of the young peasant outside the window, Bianca assumes he is sad because he is in love and she considers it a chrming adventure !
Bianca is also superstitious and talks of the gigantic leg & foot, she reminds Matilda the chamber below is the place where a tutor drowned to death. She speaks of ghosts, a talisman, and the peasant as a magican.

I am trying to think why HW uses the device of a garrulous, superstitious servent ? Bianca's converse almost overwhems the reader with gothic stimuli.
Any other thoughts ?

I presume such words are the vocabulary of the Gothic in addition to other words here-infernal, fatal secret, mystery, terrified , dread, fury, gigantic, etc to propel the tale along.