Legal Question in Real Estate Law in New York

Not without LL consent.

Not having seen the Lease, any response would be a guess. You do not know if and/or when the property will be sold, when a closing will occur and/or when your daughter may be asked to move, if even before the end of the Lease. It may be possible the new owner will want to continue the Lease and not actually occupy themselves. More facts need be known, as well as what the Lease itself says about a sale during the Lease term.

The lease is good for a year and even if the house sells tomorrow, she can stay until the lease is up. If her possession is interfered with in any way than she stops paying rent. This includes harassment to make her more interested in moving. If things get sticky your daughter can make the landlord's life a living hell while in the worst case scenario she just moves, leaving behind the cinders of heck.