l think BB should either stop Jade drinking or get her out before she looses all her self respect. l think Jade would be horrified if she knew how she was being portrayed (even though it is her own fault) outside of the house. l personally don't like her but can't help thinking that to say it will come as a bit of a shock is an understatement.

She is over 21 and therefore legally entitled to drink.
To ban drinking altogether would be unfair on the other HM who, although they can put it away (!) don't react as she does with it. They have no obligation to stop her drinking.

BB have an obligation to her though (IMHO) as they were the ones who chose her to be in there and I personally think they should get her out and soon. She was a mistake as far as their selection process was concerned, and maybe it's time they own up to the fact and remove her.
She is damaging herself and her fellow HMs by staying.