Advice above are 100% true.
Also do you have other options? It's important to know because maybe you got scared of losing her?
Conservative background and showing you THAT MUCH signs of interest was clearly a Go! and she gave you 4 tries with likely a deadline.
No matter the background, a girl can show you an open path to her goods. She'll just want you to be man enough to respond. She might have been raised conversative but she was really active in pushing you to take her.
You being afraid of making a move killed her desire... now maybe she has another guy in her arms/bed or simply lost her interest.
Next time when you have a girl showing that much interest... forget the background, forget your fears, you have the GO.
You'll feel better doing something than doing nothing.
Here's 3 cases of my ''conservative dating''
1) Girl 1: Did all what the OP said... showed signs, asked me out etc.... so what I did? First date kiss her, take her back to my place... she was not confortable at my place but we kissed and I drop her at her car..... Now I went NC for 2 weeks due to work... she wrote me '' I thought about our night, you have amazing kiss etc... but we going the evil way, I want to go slow''.... So I wrote her : '' NP, remember I want things to go slow and been busy with work''... I cooled down the situation, never saw her again, and have to admit the ''evil way'' comment scared me... However... that was a conservative girl... kiss closed the first... asked her out to a dinner at a restaurant after.. why she rejected me ? Simple : She thought I played her, cause I dissapeared for 2 weeks... (works reasons made me dissapear) and she wanted to know if I wouldn't try to bang her again right there. She went high to low... because I didn't ask her again fast I guess
2) Girl 2: From a conservative background, told me people in her culture, just meet date and than become GF/Boyfriend... She said she had 3 LTR, made allusion to me and some traits of exs. I never tried to kiss close or other... because from what I saw... even Married couple don't kiss in public.... I am taking slow like you. We had 1 meetup, 1 date (she invited to join her a her place, meet the roomate etc)... the date ended she rubbed herself on me... I reinvited her, she mentionned having family over so she can't, fews days latre I send her bday wishes and a joke..than went NC .. now its been 2 weeks since last date. Reinvited her to a bar.... she insta-replies (sign of interest) saying she's working during the, having friends visiting for the week-end she'll ask them (for free time I guess or to join us) and will let me know. I wrote: Sounds good, btw I heard monday is a national holiday, so you don't work
Will girl 2 give me news? I doubt it... since she needs ''to coordinate with her friends''... maybe I lost my opening if I had one, maybe the last time I should have escalated, or invited her to a date again, or she was never into it (or lost interest)
Now it's been 1 day, no news.... I am expecting a reply? Nope from experience they don't get back to you.
My action: Don't act piss, will reinvite her to another date in 1 week ... if she flakes... than bye
3) Girl 3: Conservative background, I escalate at her place when we were alone, touched her on the 2-3rd date.... kiss closed later... I wasn't scared or thought about culture... Result: 5 years of LTR
In short, no matter the background the culture... A girl like your OP girl... you had to escalate!.... other conservative might have taken more time or you might have needed to create an opening for escalation... but in your case... you had it but you didn't take it.
Remember, when you start doubting or thinking... it's when you lose... act like nothing can go wrong, that you don't care the results... and you might have what you wish for.
It's always case by case, but your frame will increase the odds and experience too.