There are no longer Qualifying rounds for any of the ISU Championships.
If Canada earned two spots for JW, then there will be two spots. Two of the three JGP ladies will likely fill these spots.
There is only one spot for 2013 Worlds, and so far Osmond is the only one who has earned the minimum TES requirements for both SP and FS. If Lacoste fails to earn the FS TES minimum between now and Worlds, she cannot go even if she wins the Canadian championship (which IMO is highly unlikely anyway).
If Canada earned two spots for JW, then there will be two spots. Two of the three JGP ladies will likely fill these spots.
There is only one spot for 2013 Worlds, and so far Osmond is the only one who has earned the minimum TES requirements for both SP and FS. If Lacoste fails to earn the FS TES minimum between now and Worlds, she cannot go even if she wins the Canadian championship (which IMO is highly unlikely anyway).