Serious doubt it's actually her. You're right, $400 would probably be on the extreme cheap for her. I've seen her picture, even with the use of her name advertised in Chicago several times as well as other more well known trans girls. If you google the number, there are no other ads for it. Also it seems linked to a Facebook page of a different name and a twitch account.    

Her personal Instagram and Twitter, which is linked to her OF page,  plus her allmylinks page show nothing of being in New Jersey. It's another scammer fake...  

https://www.instagram.com/andylynnpaynee/?hl=en
https://twitter.com/AndylynnPayne
https://allmylinks.com/andylynnpayne

I agree, a bit suspicious, though not entirely unbelievable.

The ad link you shared not puts in in  "Missouri » Kansas City » Shemale Escorts" which adds a layer of suspiciousness: Orange County yesterday, KC today?  Not impossible, but seems unlikely.  (Phoenix tomorrow?  Sydney? Berlin? Fresno?)

If anyone were to call or text and get something about subscribing to OF or making a deposit, I'd say absolutely "NOPE" with a 97% confidence.

Nice Eye Candy though.  If it were verified to be her and there was some indication of goodness in a review, I'd drop 4.

Looked pretty clearly like a fake ad but decided to try texting them to make sure. Immediately requested a deposit and refused to FaceTime or send a dm from social media to verify authenticity.  

Fake!