Make your friend consult and discuss her problems.She might be having other symptoms pertaing to sleep, concentration, impulse dyscontrol etc too .
Next Steps
consult a psychiatrist or psychologist ..management would depend on result of her assessment if the problem is severe she might need medication for few days. If she is cooperative then she may benefit from CBT too
Health Tips
Dont procastinate consultation as her problems may grow spirally. Pay special heed if she says anything regarding self harm