I totally agree with Elana. Don't do anything, except cut the money flow off including the cell phone for the time being. Perhaps have no communication etiher.
When we do things when we're angry we usually regret it later.
When the gravey train comes to a stop, addicts start finding others to "help". Let her help her self for a while and see where that goes.
Keep us posted on this.
Hugs,
WW