why don't you do what we did before the internet.....just ask them if you know her well enough. if you don't, just leave a note on a napkin and run.

She has a life

I last posted on my FB account few years ago, logs on rarely, and never used the messenger app. Why someone necessarily needs to be active on FB?

It's code for "leave me alone, your efforts to stalk me on Facebook are inappropriate".

I don't use fb much either

If you know she doesn't use Facebook why are you acting confused that she isn't replying to you?

She’s younger than 30 maybe?

Maybe she doesn’t like replying on FB messenger.

She has a very high IQ?

It means she is not interested in you.
Leave her alone.

And quit chasing girls, look for a woman for a relationship.

She doesn't use it and it is not installed on her phone.

If you aren't friends there your message will go to an alt box and she will never see it

Means she’s not on lol 😂

dont do that bud, its gonna hurt you

Obviously you need to hire a private detective to find out

She’s got a life?

Not absorbed by the tech takeover, and refused EULA

I do that