Ibuprofen prostaglandin

Medical stuff:
Fracture = broken. We have lots of terms to describe the fracture, but a fracture is a break.
People can walk on a broken ankle if they are tough enough to take the pain and the tibia is not where the fracture is.
She would have had an x-ray about a week after the surgery to confirm it was well healing.
Plaster? We more often use water activated fiberglass these days. Less heat as it cures, sets quicker.
Very likely she would have been put in a walking boot.
Advil = Motrin = ibuprofen. Each pill is 200mg, so three were a good choice, four a bit better. Redose after six hours if the pain has returned.

First of all, you're not going to cause an 'air embolism' but putting air into a vagina. Have you ever been having vigorous penis-in-vagina sex, perhaps doggystyle, and ended up with queefs, or pussy farts, or whatever you want to call air exiting the vagina that was pushed in unintentionally?
Me too. Guess what, nobody died. Nobody is going to die from blowing air into a vagina either. I suppose if you hook an air compressor up to a vagina you could do damage, so don't do that. I would say don't blow air into a vagina because it doesn't provide pleasure, and you should rub a clit or something else instead, but not for any medical reason.
There really is such a thing as an air embolism. This is why medical professionals are careful when loading syringes with an IV medicine, to not directly inject air into the bloodstream. You'll see them do things like loading syringes upside down because the air bubbles leave the syringe this way. Injecting air directly into the veins with a syringe or other IV method is how you end up with an air embolism. Avoid this, and you're fine.
Now for the smaller mistake, which is more an error of omission. Prostaglandin is a substance found in male ejaculate, which can assist in ripening of the cervix (aka, open it so the baby can be born). A synthetic, concentrated version in gel form is sometimes rubbed onto the cervix in clinical settings to speed up labor. Having the guy ejaculate in a laboring woman is a known 'midwife trick' to ripen the cervix. It won't induce labor, but it will speed up a labor that is already under way. In extreme concentrations, like those possible with the synthetic concentrated form, prostaglandin is used to relax / ripen the cervix for an induced birth or abortion.