No.
No. .357 Sig and 9mm are two completely different calibers and not interchageable.
100-400 or so
50-400 usd
Submachine gun rated 9mm
No. Some .40/.357 Sig pistols can be converted to fire 9mm simply by dropping in a 9mm barrel and using the 9mm magazines, though. Not sure about the Glock.
No. The mags for the 9mm are different than the mags for a .40 S&W
Sig
The .357 Sig is a 9mm projectile, loaded into a necked down .40 S&W casing.
Follow the instructions provided by SIG
Yes
She usually uses the Sig P229 but in some occasions is carrying the P228 or P239