Not at all uncommon. Many women - especially those who cum primarily from clitoral stimulation - require a refractory period similar to men. The clitoris is a homologous structure to the penis, meaning it develops from the same tissue in the womb. You can imagine (or know firsthand) what it’s like if the head of your penis (analogous to the clitoral head) is stimulated after you’ve already cum. The difference between most men and women’s refractory periods is that the clit can be ready for more stimulation usually faster than the penis will fill back up.
My wife is usually a one-and-done gal. She says usually the second one takes more work and is less rewarding and it’s not worth it. She’s especially sensitive after cumming from oral or her Melt/Womanizer on her clit (my favorite recent oral development has been working on getting my tongue perfectly still and flat on her clit as she tips over into orgasm with a tight seal of my lips around so that she has the warm and wet sensation through her O without further stimulation to irritate her). She’s more inclined to go for a second if the first was from her being on top cowgirl or reverse, but even then she only went for 2 once this year and I had to go back to 2022 to find her shooting for 3. Add to it we had a period of some years where I caused her to feel a lot of pressure to achieve multiple orgasms and killed her enjoyment of it. On the other hand, when she’s masturbating alone if we’re apart she will often go for two as they’re more “quick and dirty” and less built up than having sex together.
Anyway - no, not at all uncommon.
As to squirting - if that’s a goal, use the search function to find the Wiki and other great posts with plenty of tips to help out. It’s a strange paradox of a thing that is more elusive if you shoot for it, but unlikely if you’re not trying. My wife has squirted just a handful of times and neither were trying. Once was on the 3rd of 3 orgasms while being bound, teased, and overstimulated for over an hour and she felt I pulled the orgasm out of her and she squirted all over the bedspread through to the mattress. Second time was less dramatic, but just a very amped up and aroused oral session with some calm and well-placed fingering and was more of a gentle gush than a splashing amount.