It seems there is a fine line here ( in my view ) as to who is ripping off who.
If she told you $60 for nude and then when you respectfully asked if touching were allowed, she asks for more $, that is somewhat misleading. Whether it's right or not I think a certain amount of touching is expected* ... Either way that method of pricing is not the norm. She did however, to her credit, give you a lower rate.
Either way the bottom line is that you did agree to pay and didn't follow through or meet the fee for nude. You would have been better off to pay and then share the info with other hobbyists, who most likely would stay away. Easy to say though ...
*Is it acceptable and would clients pay for extras on top of the normal licensed spa extras ( BS,NR,N,T ) ? ... I heard of someone paying for DATY ( seran wrap daty at that ) once and found it somehow pathetic. I guess the question is where is the line that paying for these "services" is justifiable. In essence we do pay, either way. It's just not spelt out.