I've only seen 3 providers, but one of the first things I've figured out is patience. How much time in-between phone calls?

I would never burn up a providers phone. Is there another way of contacting the provider? Can you email or text?
Is she newbie friendly? Keep in mind she has no idea who you are. I email my TER handle to any prospective provider first so that can at least have a glimpse that I'm real, and engaged in the hobby.

I've had providers take up to a week to respond to an email, which is fine. it's not like they have a desk job and IM people all day

I'm sure  those with more experience will answer, but I've found that BP are quick to answer and schedule, and won't waste time unless your ready to go. The more experienced and refined will respond politely to polite emails and text. Just as the session should be unrushed, so should the contact.

but hey, that's just me.

There could be any number of reasons why she has not answered your calls. She may be sick, or taking time off to attend to personal matters, or whatever. There are plenty of fish in the sea. Find another well-reviewed provider and call her instead.

If you still want to see #1, try her again in a few weeks.

Just my advice.

regarding (1) when you were hoping to see her and for how long and (2) when is it OK to return the call.  Many providers will not call back unless you said something like "I can be reached up to 5 pm today at 555-123-4567."  Most ladies understand the need for descretion.