So I have seen this traveling provider a few times when she is in my area. She is coming back and I have seen she has increased her rate. A lot of providers grandfather their rate for people they have already seen. How should I approach her about me being grandfathered or not?

If not, just ask her is she grandfathers rates for returning clients.  Based on what she says, then you decide if it's worth the extra $$$ to see her.

how often you have seen them and others only grandfather for regulars.

Anyhow, if she doesn't state about grandfather in her old rate, most likely she won't. It doesn't hurt to ask if it's a c-note. However, if her card is full, you may not get a reply.

If you were someone she wants to keep, she might. If she doesn't mention it, she might not.