If you contact her and get a message back from a "Chloe" then it is legit, the ad looked like ones run by the agency through that person. She has been the booker for a number of big name PS who have come through in the past year.
Just know beforehand that if you prefer booking on the phone with someone, or to have an option to speak to someone, that the text/email only thing with that outfit is strickly adhered by. I tried to see Briana Banks though them and requested one phone call be made to me upon arrival at the appointment (I am a dinosaur I know but I don't text, don't have it on my phone) and this was denied. Very disappointing as I was geeked as hell at the thought of meeting my fav pornstar, never was able to book because of this. I would say it is safe to say no exceptions will be made for whatever reason.
Most however would probably have no problem seeing as most people text routinely and have no issue, I say go for it if you have the time and money. I think I recall Briana Banks rate through that service was $1500 or 2k for an hour, I would say Amy would be at or near 2K.
Amy is probably in my top 5 fav pornstars of all time, though I think she tried to fix something that wasn't broken with the lips, they don't look as good as before. Unreal natural rack that girl has, not one who cares if they are real or fake, but that is one wonder of nature, actually two, for sure...