1) She can't sue for any money--there has been no injury for which the law provides compensation (there's no compensation for being propositioned, offended, etc.).2) She can report him to the state board that licenses chiropractors, for what seems like it may be an ethical violation.3) She should de-friend him, of course.4) If he keeps pursuing her after she's told him not to, she may be able to get some protective or restraining order against  him.