"and she shall shave her head and she shall do her nails": R. Eliezer says: She shall cut them. R. Akiva says: She shall let them grow long.
R. Eliezer says: "doing" (i.e., an action) is mentioned in respect to "head," and "doing" is mentioned in respect to "nails." Just as the "doing" in respect to head (i.e., shaving) is removing, so, the "doing" in respect to nails is removing (i.e., cutting).
R. Akiva says: "doing" (i.e., an action) is mentioned in respect to head, and "doing" is mentioned in respect to nails. Just as the "doing" in respect to head (i.e., shaving) makes her unsightly, so, the "doing" in respect to nails (must be something that) makes her unsightly (viz., letting them grow long.) A proof for this: (II Samuel 19:25) "And Mefibosheth the son of Saul came down towards the king. He had not done his feet and he had not done (i.e., trimmed) his mustache."