Haha, you've basically described my first date with my now-partner. She said she felt very comfortable with me, we talked forever, but she wasn't sure I liked her because I was really slow to return texts (didn't realize the etiquette) and I was kind of physically closed off but gave her a hug at the end of the night. My partner has had to make a lot of the first moves and start a lot of the big relationship talks, although I've gotten better over time as we've built trust and comfort with each other.
Not that I am representative, but I know that if I am asked a direct question I will answer it sincerely, but I won't volunteer information that makes me vulnerable because I'm uncomfortable with the social conventions around that kind of personal reveal. I wait to see if someone else does it, and then follow their lead. My partner was taken aback by my directness sometimes, but she had to be the one to bring things up.
Anyway, don't worry if you aren't getting physical signals. The 4-hour talk and hug are both good signs. You might have to put yourself out there in terms of expressing your interest and intentions if you want her to reciprocate that openness.