It is typically not a requirement to sign or initial a ticket. Many people get pissed off and refuse to sign the ticket, not knowing that physically accepting the ticket is considered "acceptance" of the consequences of the ticket. She received a copy, right? Obviously, since she has it and realized she didn't sign it. If she took a copy of it knowingly, then she accepted the duties and responsibilities of the ticket in hand. That's not to say she's guilty of the offense and shouldn't fight it in court, but it really comes down to the judge that day. The judge may think she's trying to undermine the police by getting it kicked on a "technicality" when in fact she actually physically accepted the ticket in some form or fashion, or the judge could get pissed that the officer didn't even have her sign it and kick it. It's a 50-50 chance either way to go to court on the matter, but she does in fact have to deal with it, signature or not. Always remember, the court house is sure to have a copy!!!
PS - I'm a cop and hate writing tickets...but there are times when people definitely deserve them!