If her memory wasn't bad because of the tremendous amount of stress she was under during the PH... you could say it's not bad now cuz she' not smoking doobie.
I'm not so sure BvD gave up the smokes-- but maybe she promised herself (because these people are not god-fearing), if Danielle was found alive... she'd never...
A lot of the stress, is from all of the lies-- and knowing precious time is lost by getting caught up in them. The grief is another matter.