Like Mr F suggests, I would try to reschedule with a specific day & time or a choice of 2. As for the cancellation, we'd all like an extra consideration but I wouldn't let that stand in my way if i wanted to see her. If she does not reply within a couple of days, just move on.
I recently contacted a local provider via email (per her request) and had an appointment set up for Monday afternoon. She sent me a message Monday morning telling me she had to cancel. I replied asking her when we could reschedule but I haven't heard anything.
My question is when should I try to reopen communications? Or, is she politely declining me as a client?
...perhaps she canceled due to an emergency of some kind and has fallen behind in her email and other correspondence. It's only been a couple of days. If it were me, I would give it a few more days, and then if I hadn't heard from her I might send her a very short email asking if everything was OK and if it was a good time to ask about rescheduling. If there is still no reply after that - then forget about her and move on to someone else.
Lopaw's answer is absolutely correct and very polite. But I will add my take on her response - if a lady canceled on you the day of your rendezvous I think the ball is in her court to try and make that up to you. She's already caused you inconvenience, why bother trying to book with her immediately again?
She should be trying to either apologize, explain, or give you a discount (or all of the above). I understand that accidents happen but making it inconvenient for you to do business with her is bad business.
The lady that canceled has some responsibility to "sweeten the pot" here. You can reschedule with her (someone who accidentally or not inconvenienced you) or just schedule the next lady on your list. It may be harsh but it's just business. And if your business is important to her she should at least extend the offer (discount, a little extra time, etc.).
There's a difference between being a gentleman (or gentlewoman) and being a pushover. Just my 2 cents.
it could help provoke a response
Like Mr F suggests, I would try to reschedule with a specific day & time or a choice of 2. As for the cancellation, we'd all like an extra consideration but I wouldn't let that stand in my way if i wanted to see her. If she does not reply within a couple of days, just move on.
If the person is local there is a possibility that she has figured out that there is a chance that you know each other or no people in common. She could be saving you from an awkward situation. Just move on unless she gets back in touch with you.