If that's her new rate that's what she expects. It's never polite to discuss money but after your screened if you really think you should get the old rate just ask.  

I've honored my old rate for several people I missed dates with due to their schedule or mine. If we talked and they got screened prior to my rates being raised I'm happy to honor the old rate. But every woman is different.  

Some girls keep raising their rates because of demand. When their new car scent wears off though it may be something completely different. Best of luck and lots of fun either way.

Keep in mind that it's not illegal to sell time.

It's legal for an escort to advertise and sell her time for a certain amount of money.

It's illegal to exchange lewd or sexual acts for money.

It's also illegal to escort without a license at least in many places.

Personally, I would not be offended or scared if someone asked for clarification on my rates.  If someone asks what I do for the money, I send them away.

As I raised my rates (gradually from a pitiful 140/H to my current rate of 300/H) I frequently accepted a lower rate if I'd seen someone at the lower rate before, and even if they had recently seen an ad for a lower rate.

I think it's okay to ask.

You have never met so you aren't going to get grandfathered like many do with regulars.  When you book an appt you go by the advertised rates. It's fairly common for providers to raise their rates.

I would honor the old rate if it was me who had to cancel.  If it was you that had cancelled, no dice.  But I would also make this offer up front.

In general I think it's always best to check a provider's rate before you book with her.  Rates do fluctuate with supply and demand sometimes, especially when a provider is new.  If I were you I would realize that she is not offering to see me at her old rate and pay the new one.  If that doesn't feel worthwhile to you, you might inquire about her seeing you at her old rate rather than just cancelling, but you may risk alienating her by doing so.  She may not have known what her time was worth when she was just getting started or running a limited-time introductory rate.  If she feels that her new rate is her actual/current worth, asking her to see you for less could definitely rub her the wrong way or cause resentful feelings during the session and/or in the future even if she does agree to it.  Which is why if I were you I would just pay her new rate and chalk it up to a lesson learned for you:  check a provider's current rates before you book a session with her.  That's what our websites are there for.