Try...

Contacting her again. If she's still holding a grudge, move on.

Not sure of the exact circumstances and your post is a bit vague.  

It rarely takes several attempts to meet a provider unless you are always contacting her for last minute appointments (and she happens not to be available each time you contact her) or cancelling/“rescheduling”.  

Take a look at her website. How much advance notice does she ask for to schedule a date? Is she on tour and definitely available?
 If you can give her a specific time/date in the foreseeable future beyond 36 hours that you would be able to to see her for certain... yes, reach out respectfully. I would also acknowledge the past situation, else she think you are attempting to pull a fast one by assuming she forgot.  

Otherwise, leave her alone.

and provide all requested screening info.  if she wants your money, you'll hear from her.  If not, you're no worse off than you were before.  OTOH, personally, I cannot even imagine wanting to see someone who had previously told me to never contact them again, smh ...

Now ... my memory is crazy long (I remember pretty much everything) and I personally don't throw out telling someone to NEVER contact me again lightly. I'm going to ASSume she meant it when she told you that. And nothing grinds my gears harder than someone who can't take being told with a little grace.  You've been a good boy for 6 yrs though and you can give it a shot annoy her further but hey maybe she is super forgiving.  Actions speak louder than words and if she curved you before because she deemed you a timewaster then maybe what might convince her is your putting some money where your mouth (errrr hands) is by putting down a small deposit.
Either way .... good  luck.