Final answer:
Hero's line about Beatrice indicates that Beatrice's sharp wit and cleverness are so dominant in her personality that she finds everything else comparatively insignificant.
Step-by-step explanation:
When Hero says of Beatrice, "...her wit values itself so highly, that to her all matter else seems weak," it suggests that Beatrice is so confident in her intelligence and cleverness that everything else appears insignificant or unimpressive to her.
Beatrice's wit and sharp intellect are such that they overshadow other traits or matters that could be of importance. This line from the play highlights the character's self-assuredness and the high regard she has for her own mental acuity, often leading to a dismissive attitude towards situations or people that don't meet her intellectual standards.