As a long?time landlord who primarily rents to university students, I want to clarify that you don't need to pay your daughter’s rent. Here’s why:
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Joint (not individual) lease. Because the lease is joint, the landlord cannot evict only your daughter; any eviction would apply to all four tenants, which neither the landlord nor the remaining tenants want.
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Responsibility for the full rent. In practice, when one tenant leaves under a joint lease, the remaining three roommates are responsible for covering that share until an approved replacement/subtenant is found. This usually motivates remain roommates to help locate a new tenant.
If the roommates continue to pressure your daughter, she can let them know that she does not plan to arrange a sublease herself and that, under the lease, they will be responsible for her portion until the term ends.