Quick, what's the number for 911?

The show: Boston Legal
The episode: "Oral Contracts," the eighth episode of Season 4.
What happened: Denny gets arrested for soliciting a gay prostitute in a courthouse restroom, and asks Alan Shore to represent him. Naturally, Denny considers his predicament an "emergency," and says so in a conversation with Alan and Lorraine (Saffron Burrows), who is running to an elevator, and who concludes the conversation casually suggesting they should call 999. Katie (Tara Summers) happens to overhear the conversation, and the mention of 999, the emergency phone number in England, reinforces her sneaking suspicion that Lorraine is in fact British and has worked to disguise her provenance.
Katie encounters Lorraine at the firm's library and confronts her about her past. Lorraine reveals that in England she was married to a Pakistani man, whom she cheated on. Her "co-adulterer" died in an 'accident,' prompting Lorraine to move to America to escape the 'honor' killing. Lorraine asks Katie to keep her confidence, but Katie tells her colleague Whitney, who has dug up some information on Lorraine.
Meanwhile, Shirley represents a shock jock fired from his station for making fun of old people.
What doesn't make sense: Ignoring for now the idea that male adulterers are ever the subject of 'honor' killings (after all, the 'accident' could have been meant only for Lorraine, or it could be the case that the "co-adulterer" is in fact a woman), does it make sense that Lorraine would continue to think of the emergency phone number as 999 rather than 911? This sort of mistake would be understandable from almost any other Brit expatriate, but given what we just learned of Lorraine's background, it's ridiculous. Think about it: this woman goes to the trouble of learning to speak with an American accent, yet she doesn't bother to fix it on her mind that the emergency phone number is 911 here. When she sees some Pakistanis closing in on her house (a distinct possibility given that she chastised Katie for putting her life in danger with her disclosure to Whitney), can Lorraine afford the delay of fumbling with the wrong number?
Or it could be that Lorraine has programmed the emergency button on her phone to 911, but then doesn't it occur to her that she could ever have to call the police from some other phone? Or maybe she just said 999 because she knew Katie was listening and wanted to tip her off. But why?