robski, just to share some inputs with regard to your problem. try to review carefully on what will be the maximum required heighr of the fence as prescribed by the deed of restrictions, and if the deed of restrictions laydown the rules on the maximum height limit of the perimeter fence you have the right to tell her to removed what she added on the portion of the fence. one thing you should consider also on this things will on what is the intention of the adjoining property. is she has the intention to make that fence higher so that she can extend one side of his building footprint to used it as one part of the wall to add another usable space? if you think that the adjoining property violates your natural light and ventilation as prescribed on the provisions of the Civil code asd will as the provisions prescribed by PB 1096 "The National Building Code of the Philippines" that addition to the existing fence can be removed by asking the help of your Local building official. but of course exhaust first the remedy by asking her to removed it, or inform her thru a letter that she should removed it, other wise if she will not make action to your request, you can now ask the ais of the Local Building official who has jurisdiction on the inspection of all building structure in your locality.
Good Luck
Arch. Alfredo A. Fernandez, UAP, LLB
Practicing Architect
Lecturer-Building Laws
LAW