A shotgun has close to zero spread at 3-5 yards, the width of most rooms. (A yard is about equal to a meter for those not familiar with imperial measurements.) The spread is probably not more than a quarter at this close range. (That's an inch or 2.5 centimeters.)
I would not recommend a shotgun for a small woman. It packs a kick. Far better to have a .223. There is far less kick and the user wouldn't procrastinate practicing because they dreaded the kick back.
I suppose if it was cut down in half (from 28" to 14") there would be greater spread - but I don't know how much. I've never shot one, or seen the pattern.
Not saying your wrong, but two comments:
One argument that people use for a shotgun vs. a high velocity military round has to do with collateral damage. e.g., hitting your kid in the next room or your neighbor in the next apartment over.
Some jurisdictions (like where I am now) make it fairly easy to 'own and possess' what is considered to be a lower powered weapons (handguns up to .45 ACP, shotguns (slugs OK)) but it's a real bitch to get a .223.
Another bit of advice that I've heard which I concur with: Don't fall for the old-wives tale that you don't need to aim a shotgun. Especially if you don't practice all the time. This comes down to the minimal spread mentioned in the post above.
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Just as an aside, it seems that firearms cost two to three times as much in The Philippines as they do in the United States for the same piece. It's also worth note that gun ownership in The Philippines is a privilege and NOT a right as it is in the United States (in theory and for now.) That was made clear to me.
I would note also that I got nothing but support and encouragement to have a firearm (or many) available to me by all concerned. All considered it a good idea...even those who don't stand to make some money on the deal.