I have no idea... buy my DS weaned at 17 months after my milk dried up at 16 weeks pregnant. It took him a month to "let go" (he'd go a couple of days with nothing, then decide to give it another shot to see if anything came back etc etc...), so I very much doubt she'll go cold turkey so quickly! If anything I'd say you'll get back from your weekend away and she'll be a little booby machine to catch up on what she missed out on XD