I think her strategy was to harass people and scare away signers.
So I am a bit of an amateur attorney and I looked up State Election Code.
Please call the police if it happens again. Here is the text:
CALIFORNIA ELECTIONS CODE
18630. Every person who threatens to commit an assault or battery on a person circulating a referendum, initiative, or recall petition or on a relative of a person circulating a referendum, initiative, or recall petition or to inflict damage on the property of the circulator or the relative, with the intent to dissuade the circulator from circulating the petition or in retribution for the
circulation, is guilty of a misdemeanor.
18631. Every person who forcibly or by stealth takes from the
possession of a circulator any initiative, referendum, or recall
petition on which one or more persons have affixed their signatures
is guilty of a misdemeanor.
So if you are THREATENED, call the Pleasanton Police again if you need it, and then press charges.