Does what the girl mentioned about her feeling that she hates Ali (may Allah be pleased with him) due to the exaggeration of the Shiites concerning him, and her description of Omar ibn al-Khattab (may Allah be pleased with him) as harsh, constitute slandering that expels her from the fold of Islam?

Whispers [of doubt/evil] should be resisted, and efforts should be made to get rid of them. The words that were uttered are not disbelief (kufr) and do not expel one from the faith. However, such phrases should not be uttered. One must control their tongue and refrain from using harsh words against the Companions. One should also increase in seeking forgiveness (istighfar) and repentance, as repentance erases sins. Suicide is among the greatest sins, and one must strive in supplicating for well-being.