They're some really impressive lifts at her bodyweight. Probably enough to win her the best female title in the IDFPA national champs in Wexford on January 26th '08. Might be a comp you could get her to have a go at!!
Where's the comp on December 1st at??
As for peaking... Mattwray said it, everyone has their own way. Since he's probably more advanced than her he needs to start to taper down earlier. I'm lifting on November 18th and I hit my last heavy deadlift last night. I pulled my opener for 2 reps.
Just keep it simple, increase the weight and decrease the sets over the next few weeks.
The comps like 5 weeks away? and say she's shooting for a 150kg deadlift...
She'd want to be taking the week before the comp (23/11-1/12) off. Then the week before a heavy deadlift, but slightly less than her opener. The week before that something like a set of 3 with 130ish kg, and the week beofre that, which would probably be this week, 120kg 3x3.
As it stands the competition is probably too close to make any drastic strength increaes, just keep working hard and don't let her do anything silly.
Are you familiar with all the different commands and rules of compeition?