Are there actual RULES for dating as adults (Times between dates etc) especially has childhood friends?

I am asking this question as I have been seeing this girl lately.
She is a single mother.
We have been childhood friends (Our parents know each other, went to same primary school etc.)
We have always been talking casually for years, but a lot more since she got single. especially when she found out we both have dyspraxia.
We met for coffee. I believe it was a date, but she had to postponed because daughter issues, and then kept asking on times/day where to go etc and even took me on tour on where she worked (she had a coffee place there so this where we went).
Eventually had the "date". We kept talking about our lives, catching up. It lasted two hours never checked her phone even if it bleeped, she even walked me back to the tramway station and waited with me until it came even though she had a car and told her she could leave me there but NO, she wanted to stay until the tramway came and said goodbye see you soon etc.

It has been three weeks but, she is managing her own business and she has a 7 year old girl, so of course, thoses are her priorities, and i told her she has all my support and I understand that.

Since then We kept texting. She most of the times uses voices messages , but she always tells about her day, what she is doing with her daughter, tells me about her, (as a musician she posted me pictures of her girl trying intruments) ... but she is always curious about me as i am unemployed but have plans etc. she is very encouraging, wishes me luck on my work interviews, etc... she is very open on her daily schedules, asks how I am doing , but it doesn't like she seems to ask on a seconde date... should I be worried or is this normal for single moms?

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My question refers that is this normal to take that long for second dates when we are both adultes especially one is a single mom, as people always tell me normally, the second date should come early if she is into it?
Are there actual RULES for dating as adults (Times between dates etc) especially has childhood friends?
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