The law of course will vary locally a little bit but here’s a solid set of general legal advice for the US concerning roommates: https://www.lawyers.com/legal-info/real-estate/landlord-tenant-law/roommates-rights-and-liabilities.html

OP’s friend has a few limited options here:

• Find someone else to take over the lease. Finding a replacement roommate to take over the remainder of the lease or start a new one may be an option most landlords would consider and may allow her to leave with no cost.

• If the roommates are particularly dirty to the point of causing damage to the domicile above and beyond normal wear and tear, she could report them to the landlord who could evict them, but that’s not likely to happen just because they leave trash around or don’t do dishes. And recourse for the landlord may legally be limited to simply keeping the deposit or fining the tenants when they leave/renew.

• Make sure the roommate agreement is actually legal. Is it with the landlord, or a tenant? Is it a legal sublet? (Ie, the people who are renting from the landlord are renting out a room for her but the landlord isn’t aware) if it’s not on the up and up, she might have a little more recourse. This shouldn’t be hard to figure out.

• Work with her roommates to tactfully request help/establish chores and responsibilities for common areas so everyone pitches in. Make it easy (or hard to dissent), organized, and inclusive and a lot of people might be more inclined to pitch in. This will take some tact, and may not work, but it may result in a much cleaner place that everyone is happier to live in. You’d be surprised how receptive people can be to assertive leadership in such situations. She probably doesn’t want to have to mother other adults, but such is the situation she’s in.

Best of luck! And remember, it’s just one year.