Girls - have you ever cum from a spa jet induced orgasm?

From a shower head yes, spa it's not as easy to keep the position right.

I've heard of those flexible shower head things (shower head on a 'stainless steel snake' type of hose not in a fixed position high on the wall like mine is) being able to give women orgasms...

https://badgirlsbible.com/how-to-masturbate-with-a-shower-head

I watched my wife do that

A few times

It must be good

my wife has from a shower head