Presumably she is only one member of the EC. Can you appeal to the other members?
In the ACT the strata legislation has a code of conduct for EC members. Even if NSW does not have this, you could try referring to the ACT code since it articulates reasonable principles that one could reasonably expect anywhere. Item 6 Nuisance might apply here.
ACT UT(M)A 2011
Executive committees—code of conduct
1 Understanding of Act and code
An executive member must have—
(a)a commitment to acquiring an understanding of the Act, as relevant to the member’s role on the executive committee; and
(b)a good understanding of this code.
2 Honesty and fairness
An executive member must act honestly and fairly in exercising the member’s functions as an executive member.
3 Care and diligence
An executive member must exercise reasonable care and diligence in exercising the member’s functions as an executive member.
4 Acting in owners corporation’s best interests
An executive member must act in the best interests of the owners corporation in exercising the member’s functions as an executive member, unless it is unlawful to do so.
5 Complying with Act and code
An executive member must take reasonable steps to ensure that the member complies with the Act, including this code, when exercising the member’s functions as an executive member.
6 Nuisance
An executive member must not—
(a) cause a nuisance on the land; and
(b) otherwise behave in a way that unreasonably affects a person’s lawful use or enjoyment of a unit or the common property.
7 Unconscionable conduct
An executive member must not engage in unconscionable conduct in exercising the member’s functions as an executive member.
Examples
1 improperly using the executive member’s position on the executive committee to gain, directly or indirectly, an advantage personally or for someone else
2 exerting undue influence on, or using unfair tactics against, the owner of a unit in the units plan
Note An example is part of the Act, is not exhaustive and may extend, but does not limit, the meaning of the provision in which it appears (see Legislation Act, s 126 and s 132).
8 Conflict of interest
An executive member must disclose to the executive committee any conflict of interest the member may have in a matter before the committee.