My suggestion is to offer mediation, which would be required to bring any legal action. Getting a restraining order will only escalate the situation and divide the community to those who support her and those who support the board. These situations never end well and take years to resolve.
If it appears at or after mediation the woman is being irrational, then you can at least keep community support by claiming you tried an amicable solution. And you will know exactly what information she has and why she thinks it means the directors are stealing money. Maybe what makes sense to you isn't so clear to her and talking it out will help. If not, the beauty of mediation is nothing discussed in mediation can be disclosed, so she will need to watch what she says.
Your association will need a lawyer if you do not already have one.
This communication is not intended to create an attorney/client relationship. It is always recommended you consult an attorney in person to discuss your case. The Law Offices of Stage & Associates practices state-wide and represents homeowners and community associations. Please visit our website at www.stagelaw.com.