If guys are demanding to see the providers at their current rate, nothing is going to change. If that demand drops and she is not getting by or cannot afford the luxuries she has become accustom to then she may offer a discount, but more than likely this will be to the 10-15 regulars she has that may have cut back seeing her and not made public.  

Only after that if her needs or wants is not met will she run a special publicly. After the special has expired if her financial situation has not improved either by demand or picking up some regulars during her special rate would she then need to consider lowering her rate.  

I think I read somewhere on this forum not to long ago by a provider that she would only consider a discount if that meant a significant increase in income.  

If a provider normally charges 500 an hour and see's 3 clients a week she is grossing 1500. If she lowers her rate by 100 and charges 400 an hour but only picks up 1 client on average per week she is only grossing 1600. So that one extra guy only raised her gross an extra 100. Under this scenario most providers would not discount their rate.  

Take the same scenario above and she starts averaging 5-6 guys a week then she may consider charging 400. Of course this a simple scenario and does not take in account other factors such as having the time devote, personal preferences on how many/type of guys she wants ect.