I'll probably be criticised for asking supplementary questions on a negative review, but more detail would be useful so here goes.
You mentioned drug use. Was she ever obviously under the influence of drugs on a punt?
You hint at deterioration. Do you mean in reliability (apparently often an issue for her anyway), performance, attitude, etc?
More detail on her MO in trying to steal money from you would be useful. Did she try to engineer the situation, was she opportunistic, etc. How did she respond when you caught her?
I ask these questions as irrespective of a negative review there will still be punters booking her.
Incidentally Steve, I don't know how experienced a punter you are but I generally only take the necessary money, punt phone, and keys to a punt. You never know who's untrustworthy or who can become so.