she knew her own powers
Trollope describes Arabella as being aware of her feminine powers and her ability to use them on Lord Rufford. Arabella is at this point attempting to secure time with Lord Rufford at Mistletoe, albeit with limited success. This is a continuation of the armor and weaponry imagery that Trollope has used with Arabella previously. Similar imagery can be found in the Iliad of Homer, where Hera is described almost as a warrior putting on his armor before she attempts to seduce Zeus in an attempt to help her beloved Argives. [CMC 2012]
Source: Homer, Iliad 14.166-186.