Seeing that I am a person who has dealt with,and moved past a soap opera fueled work enviroment,I can kind of understand where you are coming from.It's all fun and games until you are playing a leading role in the soap opera,and my guess is that you were a bystander to this ladys'"attitude"until that fateful day when your shins met her breadcart.Then you bacame involved,and enraged at the onesided world of buisness management, and the enevitable acceptance of the workplace snitch.It's sad,but true.
And I bet that you are scared that you will become a boss that reluctantly caves into the plight of said snitch.
My advice would be to:
1.When the time comes, act accordingly.
2.Keep an open mind,and listen to this employee.
3.Determine whether this employee has good intentions,or is motivated by drama.
4.Whatever you do,don't undermine your integrity by buying into the drama if that is the case.
5.Realize that to maintain a positive,hard working crew/staff,you have to also maintain a neutral standing when it comes to workplace politics;don't allow yourself to pit one employee against the other,this just adds fuel to the fire.
6.Remember YOU'RE the boss.YOU have to maintain the kind of work enviroment you want for your employees,and yourself.
I hope this helps a little,and I hope that you end up having a wonderful experience as a boss
Good Luck!!!