Friend ?

Good grief, our German Shepherd had better manners than your friend. When we had visitors she would wait a few minutes and then sit looking at the kettle and give a sharp 'woof'. If ignored she would wait then give a few more woofs looking at me then the kettle. Once it was switched on she would settle down and generally ignore the visitor.

Doesn’t sound like a friend to me.
Who doesn’t offer a visitor tea and biscuits?

It sounds as if you're not really getting anything from this "friendship". In your position, I think I would just let it wither. Don't phone her, don't go round there and, from the sound of it, she'll be too busy playing with her iphone to notice!

Thanks,I had thought of taking a flask!

Sounds a bit of a one-sided friendship.
I would be wary of any person that had no empathy for my sick friend.
If you do however get any enjoyment out of visiting her I would recommend that you take your own
water/ juice in a bottle.
This will quench your thirst and keep you cool.

Life however is too short to be talked at rather than have a chat with.