I've contacted an attorney today and he had a good laugh at the whole situation. Directed at her, not me...
He calmed me down quite a bit and told me that I already have plenty of ammo (no pun intended) on my side. Two visits by cops and now a Criminal Trespass Warrant. He said if anything she's got ever makes it to court, he'd be very surprised. He did say that he would gladly take the case. Then again, what lawyer wouldn't take a case that would be an easy win?
Thanks for listening everyone.
BTW - City of Austin does have an ordinance on the books that states:
as well as§ 3-2-1 RUNNING AT LARGE PROHIBITED.
Except as specifically provided in this title, an owner or handler may not allow livestock, fowl, a dog, or other domestic or dangerous animal or reptile to run at large.
Source: 1992 Code Sections 3-1-3(G), 3-2-2, 3-2-25, and 3-3-2; Ord. 031009-9; Ord. 031211-11.
§ 3-4-6 DEFECATION BY A DOG OR CAT.
An owner or handler shall promptly remove and sanitarily dispose of feces left on public or private property by a dog or cat being handled by the person, other than property owned by the owner or handler of the dog or cat.
Source: 1992 Code Section 3-3-7; Ord. 031009-9; Ord. 031211-11.