this explains
In describing the chronology of events, the chief upended a timeline that District officials provided Wednesday regarding Relishas whereabouts. School officials had said earlier that Relisha attended school March 5, and a person familiar with the investigation said that she was seen at the school March 7. Lanier said Thursday that there have been no confirmed sightings of Relisha after March 1.
SNIP
But police could not confirm the March 5 and March 7 sightings after interviewing school employees, according to a person familiar with the investigation. Authorities double-checked and learned that information from a teacher and a front-desk clerk conflicted about whether Relisha was at school March 5.
And the teacher who initially remembered talking to Relisha on Friday, March 7, said the conversation could have occurred the previous Friday, Feb. 28. There is an ongoing investigation about when she was where on what days, and as that investigation goes forward, the days may shift, Pedro Ribeiro, a spokesman for Mayor Vincent C. Gray (D), said Thursday. This is something continually in flux.
http://www.washingtonpost.com/local...2057ae-b5ad-11e3-8cb6-284052554d74_story.html
Relisha was marked absent from school on the th but her siblings arrived late (they were marked tardy) and it was assumed that perhaps Relisha showed up with her siblings but no one has specific recall of seeing her that day.
I think the siblings are talking too. At least I hope so, maybe they can provide more info on Relisha's comings and going, although young.