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Hello again and thanks for requesting me..
1. Should we resend the certified letter to the landlord? .
Not necessary, If he didn't pick it up the first time, he won't the second. The point was just to create a paper trail that she was notifying the landlord she was breaching. But if the other girls are paying the full rent, I don't see the landlord actually suing her. If they are only paying 3/4 then yes he might do so.
2. Since my daughter, Natalie has informed the landlord that she is breaking her lease, is she or could she be held responsible for handling anything related to any new tenants that sign a lease going forward.
If she subleases, then yes, she is still primarily responsible. But if the new tenant signs a new lease with the landlord, then no, she is no longer liable as the lease has been assigned.
If they are all under one lease then they are all each liable for the entire rent. But if he isn't making the 3 remaining tenants pay the full rent, then he may try to sue her in small claims court.
And you are very welcome.