I agree with the above user. If she did this on purpose instead of being ditsy there was probably 2 reasons:
1. Like already stated above to dump you and move on. Her having a 5 hour longer date and putting the dress out there could have been a lie, but it doesn't really matter if it was the truth or not.
2. Because she reached back out to you and apologized she probably still wants you as a client but perhaps her motive was to make you jealous or something so that you yourself would spend more on her next time than 90 mins or you get jealous and want to match or out due the guy who's coming for 5 hours.
Could be a business tactic a SP uses to lure clients into spending more. In this "game", "session", "play", etc. whatever you wanna call it it's about at times knowing how to sell so the consumer spends more. Some of these SPs who can get miserable due to their wants will also at times perhaps use emotion to get someone to help them out without putting in the work like some trade worker renovating her place at very little or free of charge basically with maybe some action here or there. It's generally the nice guys who fall for it or think in the back of their mind she'll actually fall for him or want them.
I personally won't date anyone anymore who's wanting, wanting and wanting and will cry wolf because I didn't give into another request. I have dated the few like this in my 20's and it's super annoying. The guy seeing her for 5 hours might only see her a few times then move on to another lady. Then she'll be miserable because she's lost that revenue coming in. Some of these ladies have some "Cinderalla" mindset where some wealthy guy will end up with them and shower them. It's also annoying if you start gifting people bigger items like a luxury bag because then they expect gifts in that price range or higher and it gets annoying. It becomes a game of "OMG my client/bf got me an authentic LV bag, but after that he keeps getting me items worth less". In their minds they think that you think they are worth less and get upset and move on to the next guy with funds. A lot of rich people and celebs typically deal with this too if they date those kinds of woman and men tend to lash out once the money is draining or they get tired of spending on things to constantly please someone that's highly materialistic and most people (men or women) that are materialistic in a sense live sad lives. The idea you need to walk out of your place rocking a brand that shouts "I'm wearing a badge that cost $400" usually leads to a sad life where people like that struggle with happiness.
You got time to think about the entire thing in your head and if you and her still wanna see each other because the sex was fire then continue otherwise there's nothing wrong with moving on because there's tons of options out there for her and yourself. Shrug it off and carry on. And generally when a SP finds a suitable partner/bf she tends to retire from this line of business and most times there's no need for her to tell any client (including who was her first) that she's done with the business.