It is very rare and those who say or advertise they can are bs 9 times of out 10.
It is also multi factor dependant including but not limmited to: the chemisty between you two, her mood and physical state of the day, your moves and skills.
I've been fortunate to have met several ladies of different backgrounds across Australia who are excellent squirters.
Some of whom are straight up fire hoses and can squirt within minutes of daty or penetration.
Some can reach it when both she and I are in the right pace and right time.
A few actually never knew they could squirt.
One lady in Perth told me she was never able to squirt when with clients, only did when with previous boyfriend. As always I take the word of a WL with a grain of salt but she did only squirt after I got her very worked up and it surprised both of us. She is a regular of mine now and I'm afraid I am not inclined to share her details

Point is there is no obvious way to tell whether a woman can or cannot squirt. Some can only squirt with the right partner and some don't even know that they can. You just have to explore by yourself.