Yes it's fine and normal. I'm a guy but I literally do it 2-3 times a day.

In terms of health, it becomes an issue when you do it instead of being responsible. For example, not showing up to your job/work just to stay home and masturbate.

As for the other things you mentioned, I've never heard that happen to any women I know. I know a women's clitoris can become larger during masturbation but only a tiny amount, similar goes back to normal afterwards. Same as when a guy gets hard but not as extreme in difference. Lots of fake information exists about masturbation so I wouldn't trust a lot of what you find on the internet about it.

I think you're safe you do it once per day. If it feels good and you aren't ruining your life doing it, why not do it?