I’ve been able to keep things casual but recently it’s been hard as I can tell she’s also interested. It’s a lot of small things that when added up make it obvious even with a pessimistic glass on. Her body language tone and attitude have had a 180 , she’s no longer the introverted shy girl. During one of our last dates she was genuinely sad that our time was up and we even tried extending but she had another appointment, was painful to see her leave like that .I once talked about going on a date with a civilian girl and she got super weird about it. I wish she was faking all this but no one is this good of an actor.
You seem to have convinced yourself that she's into you on a level beyond being a client. There is nothing that you describe in this quote that gives me that impression. The responses you describe are quite common in a situation where you see a sp repeatedly. Sure, she might be really happy to see you, and be more comfortable on a personal level having gotten to know you, and sad to see you go given the next client on his way in, etc. From what you describe, however, there is really no reason to think she is wanting anything more.
You have clearly developed strong feelings for her and they are clouding your judgment, or at least causing a lot of wishful thinking. Sure, it happens that SPs fall for their clients but realize most of the time you are kidding yourself. The odds are definitely against you here. Also, it's impossible for anyone on here to gauge things based on just a post. Only you are in the room with her. Again, realize you are almost definitely kidding yourself.
I think it's pretty much impossible to see a SP on a regular basis and not develop feelings for her. If you like her enough to see her over and over again, chances are she has lots of qualities that appeal to you that make it easy to develop feelings. I guess what I'm saying is, get used to it, and enjoy it for what it is. Again, don't kid yourself. Remember she is doing her job.
Also, keep in mind that you are falling for a fantasy version of her. Her on her best behaviour for an hour or whatever, doing her absolute best to pamper, spoil and please you. All dressed up sexy and focusing all on you. This isn't her in real life. Chances are, you don't have any idea what she's like outside the time you pay for. You are falling in love with someone who doesn't exist. For all you know, if you got to know her you might not find you like her. Again, you don't know her. You only know her work persona. Maybe she has a boyfriend or husband. Maybe she's gay. Maybe she's doing this job for three months then planning to move to New Zealand. Chances are you don't really know.
Having said all that, it sounds like you really need to know where she is at, so go for it and let her know how you feel, ask her out, or whatever. You really don't have anything to lose. Worst case scenario she will get uncomfortable and tell you she no longer wants to see you. At least you will have your answer and can move on to fall in love with the next SP you meet lol.
If she is interested, I think she will let you know somehow. For example, has she offered to meet outside your paid time? Has she given you her personal phone number?