Quite possible that Victoria's TER profile isn't up to date and she may not have control over it.  I would go with the Tryst rate since that is certainly up to date.

 
I had a confirmed date once with a well-known and Provider that I made through P411.   Before the scheduled time, I noticed on her Tryst ad that she had a different price.  I sent her a message asking which one was accurate.  She ended up ghosting me.  And it isn't like I'm a newbie,  More than 100 P411 Okays and 200 reviews.  But I guess I startled her and that was the way she chose to handle it.  

Good luck!

Why don't you simply review all the web info you can find and set up your appointment through the site that has the best price?  Kinda like Buying a Car Online!

I wrote a post about this exact problem a few weeks ago.  

 
In the cases where I've encountered this, the Tryst price was the 'current' price.  But, as has been suggested, try contacting her.