I agree with Amber that you should have medical insurance for your children and that it's as important as paying your rent/mortgage.
That being said, I do not agree with her lecture of you for taking your kids out for some fun. I understand that we only have a sliver of your story and don't know your circumstances. I know a lot of people are getting laid off and losing insurance, or can't afford both health insurance and putting food on the table.
As far as the broken nose, if she is in pain, you should get it looked at. It could just be very badly bruised but it could be broken. They don't do much for broken noses, but it would be good to check it out to make sure there isnt any other damage.
As another mom suggested, maybe you could look into applying for medicaid for the kids. Some states also have an insurance plan, where you pay for insurance but it's at a reduced rate, sometimes on a sliding scale.
I understand what it's like without insurance, but please try not to let that decide whether or not you go to the doc or urgent care or ER. urgent care is usually cheaper than a hospital's er, but a hospital will see your daughter even if you cant afford to pay.
I hope your daughters nose isnt broken and that she's not in any pain. If it's very swollen,you might want to give her Advil - it will help relieve any pain but more importantly, it's an anti-inflammatory and will help with the swelling.