Seeking advice

Ok so I wrote something similar to this before but just to refresh everyone’s memory
I like my cousin who is now married with kids . We would message each other an an app like exchange icons like hearts and flowers and more
She would tell me stuff like she goes to the gym now and she even gave me her height and weight when I asked
I don’t know if she’s was just being nice or what
But recently I just messaged her and told her I can teach her good English as she has an accent and she said Deal
I said over chat or the phone she said charting at night is better as she is always busy with kids and stuff then I asked her can we start a lesson tonight she said it will ne hard becusse everyone stays up on the weekend
I don’t know how to make of this? And how far should I go or say to test her out? Again she is really a nice person and I don’t know if she is just nice or also digging me ?