Roommate drama with my tenants

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Hello Bigger Pockets community,

I have a single family property in a college town that I lease out by the room. Long story short, I have 2 extremely good tenants that I screened well and came out ahead of most applicants. One of those 2 had a friend that was going to move into the 3rd room but backed out last minute, and she wanted my help finding a 3rd roommate to share in the bills. The 3rd tenant I found cleared the usual background checks, but since she was a freshman didn't have a rental history or credit that I could verify. Therefore I took a double deposit from her. 

She (3rd tenant) pays rent on time (was late only once, and gave me ample notice), however doesn't pay her share of bills to the tenant who the utilities are under the name of. Plus I have been notified that she isn't cooperative on house chores etc. I don't want the 2 good tenants having a bad experience due to the 3rd tenant. If you have dealt with a similar situation, how did you handle it? Is there a way I can get her to cooperate with the other 2 without getting too deep in their business? Any advise is appreciated! 

-Farren.