[morethanpretty]

I think its perfectly reasonable to keep the camera in place:
1) its already there
2) she will have to hire new people, good to be able to have the film in case anything pops up
3) customers could possible steal from the register too
4) crazy person comes in to shoot up the place/steal
I'm sure there are more reasons, but if you wait until there is another problem to re-implement the safety measures then the problem is probably harder to handle or larger than if it could have been caught/dealt with right away. Instead you have to re-do everything first. Sounds like now is a great time to make some positive changes for your business. Your employees are employees, not friends, they need to understand you're there to make a living and their actions are very important to the well-being of your company. They are expected to act like professionals, and you will treat them well with benefits, better pay ect as the business grows. That will create loyalty and good moral, a security system won't be a hassle if they understand that.