She is too weak; she can"t sit up and talk to you. A. If she weren"t too weak, she could sit up and

If she weren"t too weak, she could sit up and talk to you.

If she hadn"t been too weak, she could sit up and talk to you.

If she isn"t too weak, she can sit up and talk to you.

If she wasn"t too weak, she can sit up and talk to you.