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She told me that her personality type is ISTP, and I also asked her about her view on marriage where she told me that it's not a necessity for her, if she met the right one then she might, while I myself is looking for marriage and starting a family in future. She doesn't really think too much about her future and prefer less commitment in life. I did some research on ISTP personality and now I have more understanding on her and perhaps it explains why she reacted in this way.

I have been thinking recently about this. I really like her but part of her personality would also make me feel uncomfortable at the same time. I'm not sure whether should I continue or to get out. I never expect her to change anything, but I myself would compromise to suit her. If I were to continue, how should I approach her? Anyone have experience dating girls with similar personality?

She senses that you're ultimately trying to tie her down. That explains her sudden lukewarm attitude towards you.

So... if you grovel at her feet, she will lose interest in you completely. You have to show her that you're a compatible match whom she can enjoy her time with. The question is, is she worth all the effort you're going to have to make? And how many rejections and failed attempts are you willing to absorb?
Personally, I don't put much stock in this alphabet personality shit. Either she finds you interesting enough to like you or she doesn't, habis cerita. No need to hide behind that alphabet soup.

The last girl I knew who was big on this personality crap used it as an excuse to go screw around behind my back.

True dat!

If she likes you, she'll make it easy for you. If she comes up with all this complicated shit like that alphabet soup and puts em up like an obstacle course in front of you, I'd just drop her like a bad habit. Not worth my time. But that's just me.

TS might be different. He's probably young and has all the time in the world to absorb her games and rejections. Me.... fukk it. If she doesn't want to enjoy my companionship for whatever reason, get the hell out of my life coz I ain't got time for juvenile games.