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Unfortunately, I don't believe you have enough here to allow you to resign and still get unemployment.
On the first issue with the book keeper quitting, that gives you no legal basis for resigning and getting unemployment at all. In employment, unless you have a contract that specifies that you your terms of employment can only be altered with your consent, your employment terms are "at will" and can legally be altered at any time. Only a significant reduction in your actual pay can constitute a sufficient basis for resigning and getting unemployment.
On the second issue, two girls bringing guns into the office doesn't meet the standard of establishing an unsafe workplace. Perhaps you left some facts out here, but you'd need to show that there were threats made against you or the office, that you went to the employer and asked them to resolve the safety issues, and the employer refused. Just bringing a gun somewhere is not necessarily a safety issue. You need more than just the presence of the gun...you need evidence that show that these particular individual's reason for bringing the gun was to threaten and intimidate, such that there is a imminent safety issue AND you attempted to resolve it with the employer who refused to do anything. THEN you could resign and have a reasonable argument for obtaining unemployment.
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