I'm just wondering if she could be a he. She/he also likes to stay outside a lot...like boy cats do...but she has a sweet girly MEOW.

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The paperwork from the spay/neuter will tell you if its a boy or girl. How old is your cat and when did you get the procedure done? The surgery helps in most cases of spraying when they are young, but may take a week to a month to show behavioral changes.

It's very rare, but I have seen female spray. If she's not spayed, get it done soon. It could stop this behavior.

Yes, girl cats can spray (like boys). After being "fixed", a female, probably, has more control over that part of the body than most males. It just takes the cat's "will" to do it.