You should push for an earlier appointment on an emergency basis if there is any indication or worry about suicidal tendencies. She certainly is a candidate for that concern. Also, the medication may have to be adjusted downward because it may be contributing to the lethargy....it's a clinical call that only a psychiatrist can make.
My daughter is on med's for the same thing. Whenever I am unsure about how she's doing and do not have an appt. soon....I will call her psychiatrist and leave a message for her to call me. Then I tell her everything going on. If they feel it's serious they should squeeze your daughter in. I would call and call again till I got the doctor.
Especially if she is suicidal. They take that very seriously. That's my opinion anyway.
Keep us posted.